PSI Biology Mitosis & Meiosis

Save this PDF as:

Size: px
Start display at page:

Download "www.njctl.org PSI Biology Mitosis & Meiosis"

Transcription

1 Mitosis and Meiosis Mitosis Classwork 1. Identify two differences between meiosis and mitosis. 2. Provide an example of a type of cell in the human body that would undergo mitosis. 3. Does cell division occur during interphase? Explain your answer. 4. Explain what occurs in the S portion of interphase. Why is the S sub-phase essential in preparation for mitosis. 5. In what way is the preparation that occurs during the G1 phase similar to what occurs during the S phase. 6. Explain the importance of cytokinesis to the process of cell division. 7. What is a centrosome, and how is it significant to the process of mitosis? 8. How would you identify a cell based on appearance undergoing metaphase during mitosis? 9. How are prophase and telophase opposites? 10. Does the creation of a cell plate play a role in cytokinesis of plant or animal cells? 11. Explain the process of Somatic Cell Nuclear Transfer. 12. What stage of mitosis is the cell below experiencing? How do you know? Homework 13. Provide two reasons for why cells would undergo mitosis. 14. What are the two major divisions of the cell cycle? 15. Identify the three sub-phases of interphase, and explain the major goal of each sub-phase. 16. What is the difference between a chromosome and a chromatid? 17. What is the difference between cytokinesis and mitosis? 18. Explain the relationship between a kinetochore and the spindle fibers during mitosis. 19. Briefly describe what occurs during anaphase. 20. Why are vesicles important to the process of cytokinesis in plant cells? 21. In what type of cell would you find a cleavage furrow during cytokinesis? 22. It may be said that in plant cells, cytokinesis occurs from inside-out, while in animal cells the process occurs from the outside-in. Explain why this statement is true. 23. Compare anaphase to fishing. What similarities might exist between the two? 24. What is cloning? 25. Does an animal produced through SCNT resemble the organism that donated the nucleus or the organism that donated the egg cell?

2 26. What stage of mitosis is the cell below experiencing? How do you know? Cell Cycle Control System Classwork 27. Why do cells have a control system built into the cell cycle? 28. Explain the relationship between cancer and the cell cycle. 29. What is G 0? 30. Explain what contact inhibition is and how it helps regulate cell division. 31. Is tumor metastasis usually related to benign or malignant tumors? Why does this have a negative effect on the body? 32. Explain the relationship between chemotherapy and mitosis. How does chemotherapy specifically affect mitosis? 33. Would a patient receiving chemotherapy or radiation for cancer treatment be more likely to exhibit bodily symptoms such as hair loss and nausea? Explain your answer. 34. Explain the value of stem cell therapy for treating different types of cancers. 35. Does an embryonic stem cell or an adult stem cell have a greater potential for differentiation? Explain your answer. Homework 36. How many checkpoints exist throughout the cell cycle? 37. Mature human nerve cells exist at which phase of the cell cycle? 38. Explain the role that contact inhibition plays in regulating or not regulating cancer cells. 39. What is the difference between a benign and malignant tumor? 40. What differences exist between chemotherapy and radiation treatment? 41. A bone marrow transplant is most commonly used to treat which type of cancer? 42. Compare the checkpoints of a cell cycle to traffic lights. How are the two similar in function? 43. What is the difference between a stem cell that is pluripotent and one that is multipotent? Provide an example of a type of cell that would fall under each of these categories. Meiosis Classwork 44. What is the scientific term for a reproductive cell that utilizes meiosis for reproduction? 45. If n represents a haploid number of chromosomes, 2n would represent a number of chromosomes. 46. Provide a possible suggestion for what purpose a doctor would utilize a karyotype. 47. What is an allele? Provide two possible alleles for hair color in humans.

3 48. How many cells are produced through meiosis? How many chromosomes do each of these cells have in humans? 49. Explain how crossing over can increase the genetic diversity within a population through meiosis. 50. What is independent assortment? How does independent assortment affect genetic diversity? 51. What is nondisjunction? 52. Explain how you could use a karyotype to identify trisomy in an unborn child. 53. If Turner s Syndrome is the result of nondisjunction causing monosomy of the sex chromosomes, what is the combination of sex chromosomes in an individual experiencing Turner s Syndrome? 54. Predict the appearance of a karyotype of a zygote demonstrating polyploidy. Homework 55. Do somatic cells contain a haploid or diploid number of chromosomes? 56. What are homologous chromosomes? 57. How would the karyotype of a female differ from the karyotype of a male? 58. Explain how the process of meiosis can reduce the number of chromosomes present in a daughter cell. 59. Does crossing over increase genetic diversity in somatic cells? Why or why not? 60. With the exception of the number of chromosomes present, what other cell division process does meiosis II resemble? 61. How can an error in meiosis potentially lead to birth defects? 62. What is aneuploidy? What are the two different possible results of a zygote exhibiting aneuploidy? 63. Is nondisjunction resulting in a zygote lacking a second sex chromosome always fatal? Explain your answer. 64. How does polyploidy affect plants differently than humans? Explain your answer. 65. How many chromosomes would be present in the karyotype of an individual who has trisomy 21? Illustrations courtesy of Free Response 1. Mitosis and Meiosis are two distinct types of eukaryotic cellular reproduction. Compare and contrast them by responding to the prompts below: a. When a cell undergoes mitosis, how many cells are produced and how does their chromosome number compare to the parent cell? b. When a cell undergoes meiosis, how many cells are produced and how does their chromosome number compare to the parent cell? c. List three reasons why a eukaryotic cell might undergo mitosis. d. Why would a eukaryotic organism produce cells via meiosis? 2. Compare and contrast cancer cells and normal cells by responding to the prompts below: a. Describe the primary difference between cellular reproduction in cancer cells and in non-cancerous cells. b. What do tumors consist of and what are the specific differences between malignant and benign tumors?

4 3. Compare and contrast the two primary methods of cancer treatment by responding to the prompts below. a. Radiation therapy is non-systemic but chemotherapy is systemic. Explain the difference between systemic and non-systemic. b. Chemotherapy typically targets which structure found in the process of mitosis? How would the destruction of this structure affect mitosis? c. Radiation typically targets which structure found in cells? How would this affect mitosis? 4. Below is an image that represents the chromosomes found within a human cell. Use this image to respond to the prompts below. a. Is this the karyotype of a human somatic cell or a human gamete? Explain your response. b. Does the karyotype above represent a male or a female? Explain your response. c. Does this karyotype demonstrate any chromosomal abnormalities? If so, specify the type of abnormality; if not, why not? 5. The image below illustrates chromosomes during metaphase 1. The darker Xs represent the chromosomes from the mother, while the lighter Xs represents the chromosomes from the father. Use this illustration to respond to the prompts below.

5 a. What is the term for this variation in the way that chromosomes can line up during metaphase 1 of meiosis? b. How does this lead to increased genetic variation in offspring?

6 Mitosis and Meiosis Answer Key 1. Mitosis has five stages, results in two identical diploid cells, occurs in somatic cells- Meiosis has 10 stages, results in four unique haploid cells, used to produce gametes 2. Any body cell, such as skin, hair, nails, etc 3. No. Interphase prepares the cell for cell division. 4. The chromosomes are replicated. 5. Organelles are duplicated during G1, chromosomes are duplicated during the S phase 6. Cytokinesis divides the cytoplasm, which contains the organelles and important chemicals and energy, making sure that both new cells contain adequate organelles and nutrients for functional survival. 7. A centrosome is a microtubule organizing center, and it is crucial to mitosis because the microtubules provide a framework for the chromosomes to move during the process. 8. The chromosomes would be lined up along the center of the cell 9. During prophase the nuclear envelope disappears, during telophase the envelope is reestablished 10. Plant cells 11. This is a type of cloning- the steps are as follows: Remove nucleus from egg cell, remove nucleus from somatic cell belonging to individual you want to clone, transfer nucleus into empty egg cell, implant new egg cell into carrier organism, ensure egg cell begins embryonic development and carries new cloned organism to term 12. Anaphase, the chromosomes are being pulled towards opposite poles of the cell 13. Repair damage, regenerate lost parts, grow in size, reproduce asexually 14. Interphase and mitotic phase 15. G1, S, G2- G1: grow, produce proteins, replicate organelles S: replicate DNA G2: finish growing, final preparations for mitosis 16. Chromatids are chromosomes that have been copied in preparation for mitosis 17. Cytokinesis is the separation of the cytoplasm and the creation of new cell walls and membranes, mitosis is the creation and separation of two nuclei 18. A kinetochore is a protein structure in the centromere connecting chromatids, the spindle fibers that will pull the chromatids apart attach at the kinetochore 19. The chromatids are pulled apart to separate poles of the cell during anaphase 20. Vesicles merge together to create a new cell membrane during cytokinesis in plant cells 21. Animal cell 22. In animal cells, the cleavage furrow pinches from the outside in to create two new cells, whereas in plant cells vesicles and the cell plate form inside the cell and eventually separate the cell into two new cells 23. The chromatids are the fish, with the spindle fibers being the fishing line and the centrosome being the pole, reeling the chromatids to opposite ends of the cell 24. Cloning is creating an exact replica of a chosen organism 25. The organism that donated the nucleus, because the nucleus contains the genetic material, the empty egg cell does not 26. Metaphase, the chromosomes are lined up in the middle of the cell 27. The control system is used to regulate cell growth and division, to ensure that cells reproduce at a rate that is conducive to overall organismal health

7 28. Cancer disables the ability of the cell to regulate the cell cycle. This causes affected cells to grow and divide uncontrollably, creating the tumors that are associated with the disease 29. G 0 is a stage that non-dividing cells are perpetually stuck in, because they never pass the G 1 checkpoint and proceed with division 30. Contact inhibition is a process that regulates cell division by stopping the cell cycle when a cell physically comes into contact with other cells. This prevents cells from dividing too rapidly. 31. Metastasis is usually associated with malignant tumors. This allows cancer cells to spread throughout the body much more rapidly. 32. Chemotherapy is used to slow cell division by disrupting the mitotic spindle used in mitosis. By disrupting mitosis, chemotherapy prevents both cancer cells and normal cells from dividing. 33. Chemotherapy. Since chemotherapy is more of a general medication, it affects both healthy and affected cells, resulting in systemic side effects. 34. Stem cell therapy is specifically used for treating cancers of the blood. Stem cells are particularly effective because they are undifferentiated cells that may develop into whatever type of cell is needed by the body. This could potentially supply a sick individual with a reserve of healthy cells for the affected body part(s). 35. Three 36. Embryonic- embryonic cells are pluripotent, which means they have the ability to differentiate into pretty much any cell in the body, whereas adult stem cells are multipotent, which means that their differentiating ability is limited 37. Nerve and muscle cells exist at G 0, meaning they will not continuously grow and divide, but instead will stay in their existing state. 38. Contact inhibition causes cells to stop dividing when they physically contact another cell. Cancer cells do not exhibit contact inhibition, which is one of the reasons they will continuously divide out of control. 39. A benign tumor is non-life threatening or otherwise damaging; malignant tumors can metastasize and spread the cancer to other parts of the body, and can be lifethreatening 40. Chemotherapy consists of a combination of medicines administered which will disrupt the reproduction process of cancerous and healthy cells in the body, whereas radiation treatment is used on localized areas of the body. 41. Blood cancers 42. Just as a traffic light controls whether vehicles can proceed or need to stop, a checkpoint controls whether the cell can divide, or if it must stop. 43. Pluripotent stem cells can differentiate into most other types of cell in the body, multipotent stem cells are limited in their differentiation abilities. Embryonic stem cells are pluripotent, adult stem cells, contained in organs that must regenerate lost cells or continue to grow, are multipotent. 44. Gamete (sperm or egg) 45. Diploid 46. Doctors can use karyotypes to diagnose chromosomal disorders by analyzing the number and shape of chromosomes 47. An allele is a alternative version of a gene. For example, you may have a brown allele or black allele for the hair color gene 48. One round of meiosis produces 4 daughter cells. In humans, each cell has 23 chromosomes

8 49. Crossing-over exchanges pieces of homologous chromosomes during each round of meiosis, ensuring that each cell produced through meiosis has a unique set of DNA 50. Independent Assortment is the fact that chromosomes align independently of each other during metaphase 1 of meiosis. This increases genetic diversity because the chromosomes will align differently through each round of meiosis, and with 23 pairs of chromosomes, there are 8 million different potential combinations of chromosomes 51. Nondisjunction is when chromosomes do not separate correctly during meiosis, resulting in gametes with an incorrect number of chromosomes. 52. Trisomy would be exhibited by identifying three chromosomes at one of the 23 locations in a karyotype 53. An individual with Turner s syndrome would have XO, meaning she would have one X chromosome, and would lack a second sex chromosome. Monosomy indicates only one chromosome, and YO would be fatal. 54. A zygote with polyploidy will have a full extra set of chromosomes 55. Diploid 56. Homologous chromosomes are the same size, shape and contain the same genes, one is received from each parent 57. A male would have the sex chromosome combination of XY, Females have XX 58. Instead of replicating DNA after the first round of meiosis, the second round continues without replication, ensuring that the number of chromosomes in the daughter cells is half that of the parent cells 59. No. Crossing over only occurs in gametes 60. Meiosis II is pretty much identical to mitosis, without the same number of chromosomes 61. If fertilization occurs between two cells that do not have the correct number of chromosomes, or have experienced some form of nondisjunction, birth defects often result from this process 62. Aneuploidy is when fertilization occurs involving a gamete that has experienced an error in chromosome separation, monosomy and trisomy are both possible results 63. No, as long as one X chromosome is present, monosomy of sex chromosomes is not fatal. If only a Y chromosome is present, it would be fatal 64. Polyploidy in plants sometimes results in larger, more productive plants, and is sometimes necessary for the completion of a life cycle. In humans, it is fatal Types of Cellular Reproduction a. Mitosis results in two cells where there was one. The parent cell and the daughter cell have the same number (diploid) of chromosomes. b. Meiosis results immediately in four cells. All of the cells have half the chromosome number (haploid) of the original cell. c. Mitosis occurs when older cells must be replaced, when an organism is growing, when a repair is being made within an organism, to reproduce asexually (if this is possible for the organism), to regenerate a lost part. (any three of these listed) d. In order for offspring to have the correct number of chromosomes within its cells (diploid, the same number as parent cells), during sexual reproduction, the number of chromosomes in gametes (or egg and sperm) must be halved. When gametes then combine, the correct number of chromosomes exist in

9 the developing organism. Meiosis accomplishes this halving of the chromosome number. 2. Cancer a. Cancer occurs with uncontrolled cell division. The cell cycle control system stops regulating the correct amount cell reproduction, so cell reproduction (mitosis) continues unchecked. In non-cancerous cells the cell cycle control system is in the off position during G1 (gap 1) and G2 (gap 2) and cell reproduction (mitosis) cannot go forward unless a specific signal occurs that allows mitosis to proceed. b. Tumors are masses of cells that do not respond to contact inhibition and continue dividing past any need for new cells. The term malignant is given to cancers that are harmful and/or lethal by damaging surrounding tissues. Benign tumors are masses of cells that do not severely damage surrounding tissues and that are not life threatening. 3. Cancer Treatment a. Non-systemic means that the treatment, radiation, most affects the cells in the location where it is applied. Systemic treatments, such as chemotherapy, affect the cells throughout the body in addition to the cancerous cells. b. Chemotherapy most typically disrupts the formation of spindles. Without these structures the chromatids cannot travel from the center of the dividing cell (during mitosis) to the poles during anaphase. Mitosis cannot successfully occur. c. Radiation damages the DNA inside of cells, which does not allow the cells to continue dividing. 4. Karyotype a. This is a karyotype of a somatic cell. There are 46 total chromosomes, the number found in a diploid cell, which is a somatic cell. b. This is the karyotype of a male. By definition, if cells contain a Y chromosome, regardless of how many X chromosomes may be present, the organism is male. c. There are no chromosomal abnormalities. There are 23 pairs of chromosomes in this karyotype, therefore, this is a normal male. 5. Meiosis a. Chromosome can line up during metaphase 1, in any combination of chromosomes from mother or father. This is called independent assortment. b. Independent assortment allows a gamete to carry some chromosomes from the mother and some chromosomes from the father. This random assortment means that brothers and sisters receive differing amounts of chromosomes from either parent with them all still adding up to 46 total. Therefore, siblings may appear (or produce proteins) extremely similarly to completely differently depending upon this random independent assortment.

Cell Growth and Reproduction Module B, Anchor 1

Cell Growth and Reproduction Module B, Anchor 1 Cell Growth and Reproduction Module B, Anchor 1 Key Concepts: - The larger a cell becomes, the more demands the cell places on its DNA. In addition, a larger cell is less efficient in moving nutrients

More information

1. When new cells are formed through the process of mitosis, the number of chromosomes in the new cells

1. When new cells are formed through the process of mitosis, the number of chromosomes in the new cells Cell Growth and Reproduction 1. When new cells are formed through the process of mitosis, the number of chromosomes in the new cells A. is half of that of the parent cell. B. remains the same as in the

More information

Cell Division Mitosis and the Cell Cycle

Cell Division Mitosis and the Cell Cycle Cell Division Mitosis and the Cell Cycle A Chromosome and Sister Chromatids Key Points About Chromosome Structure A chromosome consists of DNA that is wrapped around proteins (histones) and condensed Each

More information

Lecture 7 Mitosis & Meiosis

Lecture 7 Mitosis & Meiosis Lecture 7 Mitosis & Meiosis Cell Division Essential for body growth and tissue repair Interphase G 1 phase Primary cell growth phase S phase DNA replication G 2 phase Microtubule synthesis Mitosis Nuclear

More information

CHROMOSOME STRUCTURE CHROMOSOME NUMBERS

CHROMOSOME STRUCTURE CHROMOSOME NUMBERS CHROMOSOME STRUCTURE 1. During nuclear division, the DNA (as chromatin) in a Eukaryotic cell's nucleus is coiled into very tight compact structures called chromosomes. These are rod-shaped structures made

More information

List, describe, diagram, and identify the stages of meiosis.

List, describe, diagram, and identify the stages of meiosis. Meiosis and Sexual Life Cycles In this topic we will examine a second type of cell division used by eukaryotic cells: meiosis. In addition, we will see how the 2 types of eukaryotic cell division, mitosis

More information

Chapter 13: Meiosis and Sexual Life Cycles

Chapter 13: Meiosis and Sexual Life Cycles Name Period Concept 13.1 Offspring acquire genes from parents by inheriting chromosomes 1. Let s begin with a review of several terms that you may already know. Define: gene locus gamete male gamete female

More information

The cell cycle, mitosis and meiosis

The cell cycle, mitosis and meiosis The cell cycle, mitosis and meiosis Learning objective This learning material is about the life cycle of a cell and the series of stages by which genetic materials are duplicated and partitioned to produce

More information

Sexual Reproduction. The specialized cells that are required for sexual reproduction are known as. And come from the process of: GAMETES

Sexual Reproduction. The specialized cells that are required for sexual reproduction are known as. And come from the process of: GAMETES Sexual Reproduction Sexual Reproduction We know all about asexual reproduction 1. Only one parent required. 2. Offspring are identical to parents. 3. The cells that produce the offspring are not usually

More information

4.2 Meiosis. Meiosis is a reduction division. Assessment statements. The process of meiosis

4.2 Meiosis. Meiosis is a reduction division. Assessment statements. The process of meiosis 4.2 Meiosis Assessment statements State that meiosis is a reduction division of a diploid nucleus to form haploid nuclei. Define homologous chromosomes. Outline the process of meiosis, including pairing

More information

1. Why is mitosis alone insufficient for the life cycle of sexually reproducing eukaryotes?

1. Why is mitosis alone insufficient for the life cycle of sexually reproducing eukaryotes? Chapter 13: Meiosis and Sexual Life Cycles 1. Why is mitosis alone insufficient for the life cycle of sexually reproducing eukaryotes? 2. Define: gamete zygote meiosis homologous chromosomes diploid haploid

More information

LAB 8 EUKARYOTIC CELL DIVISION: MITOSIS AND MEIOSIS

LAB 8 EUKARYOTIC CELL DIVISION: MITOSIS AND MEIOSIS LAB 8 EUKARYOTIC CELL DIVISION: MITOSIS AND MEIOSIS Los Angeles Mission College Biology 3 Name: Date: INTRODUCTION BINARY FISSION: Prokaryotic cells (bacteria) reproduce asexually by binary fission. Bacterial

More information

Chapter 13: Meiosis and Sexual Life Cycles

Chapter 13: Meiosis and Sexual Life Cycles Name Period Chapter 13: Meiosis and Sexual Life Cycles Concept 13.1 Offspring acquire genes from parents by inheriting chromosomes 1. Let s begin with a review of several terms that you may already know.

More information

Meiosis is a special form of cell division.

Meiosis is a special form of cell division. Page 1 of 6 KEY CONCEPT Meiosis is a special form of cell division. BEFORE, you learned Mitosis produces two genetically identical cells In sexual reproduction, offspring inherit traits from both parents

More information

Chapter 3. Cell Division. Laboratory Activities Activity 3.1: Mock Mitosis Activity 3.2: Mitosis in Onion Cells Activity 3.

Chapter 3. Cell Division. Laboratory Activities Activity 3.1: Mock Mitosis Activity 3.2: Mitosis in Onion Cells Activity 3. Chapter 3 Cell Division Laboratory Activities Activity 3.1: Mock Mitosis Activity 3.2: Mitosis in Onion Cells Activity 3.3: Mock Meiosis Goals Following this exercise students should be able to Recognize

More information

Chapter 12: The Cell Cycle

Chapter 12: The Cell Cycle Name Period Chapter 12: The Cell Cycle Overview: 1. What are the three key roles of cell division? State each role, and give an example. Key Role Example 2. What is meant by the cell cycle? Concept 12.1

More information

CHAPTER 9 CELLULAR REPRODUCTION P. 243-257

CHAPTER 9 CELLULAR REPRODUCTION P. 243-257 CHAPTER 9 CELLULAR REPRODUCTION P. 243-257 SECTION 9-1 CELLULAR GROWTH Page 244 ESSENTIAL QUESTION Why is it beneficial for cells to remain small? MAIN IDEA Cells grow until they reach their size limit,

More information

Bio EOC Topics for Cell Reproduction: Bio EOC Questions for Cell Reproduction:

Bio EOC Topics for Cell Reproduction: Bio EOC Questions for Cell Reproduction: Bio EOC Topics for Cell Reproduction: Asexual vs. sexual reproduction Mitosis steps, diagrams, purpose o Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis Meiosis steps, diagrams, purpose

More information

Lecture 11 The Cell Cycle and Mitosis

Lecture 11 The Cell Cycle and Mitosis Lecture 11 The Cell Cycle and Mitosis In this lecture Cell division Chromosomes The cell cycle Mitosis PPMAT Apoptosis What is cell division? Cells divide in order to reproduce themselves The cell cycle

More information

If and when cancer cells stop dividing, they do so at random points, not at the normal checkpoints in the cell cycle.

If and when cancer cells stop dividing, they do so at random points, not at the normal checkpoints in the cell cycle. Cancer cells have escaped from cell cycle controls Cancer cells divide excessively and invade other tissues because they are free of the body s control mechanisms. Cancer cells do not stop dividing when

More information

5. The cells of a multicellular organism, other than gametes and the germ cells from which it develops, are known as

5. The cells of a multicellular organism, other than gametes and the germ cells from which it develops, are known as 1. True or false? The chi square statistical test is used to determine how well the observed genetic data agree with the expectations derived from a hypothesis. True 2. True or false? Chromosomes in prokaryotic

More information

Workshop: Cellular Reproduction via Mitosis & Meiosis

Workshop: Cellular Reproduction via Mitosis & Meiosis Workshop: Cellular Reproduction via Mitosis & Meiosis Introduction In this workshop you will examine how cells divide, including how they partition their genetic material (DNA) between the two resulting

More information

Chapter 12: The Cell Cycle

Chapter 12: The Cell Cycle Name Period Chapter 12: The Cell Cycle Overview: 1. What are the three key roles of cell division? State each role, and give an example. Key Role Reproduction Growth and development Tissue removal Example

More information

Cell Division CELL DIVISION. Mitosis. Designation of Number of Chromosomes. Homologous Chromosomes. Meiosis

Cell Division CELL DIVISION. Mitosis. Designation of Number of Chromosomes. Homologous Chromosomes. Meiosis Cell Division CELL DIVISION Anatomy and Physiology Text and Laboratory Workbook, Stephen G. Davenport, Copyright 2006, All Rights Reserved, no part of this publication can be used for any commercial purpose.

More information

Cellular Reproduction

Cellular Reproduction 9 Cellular Reproduction section 1 Cellular Growth Before You Read Think about the life cycle of a human. On the lines below, write some of the stages that occur in the life cycle of a human. In this section,

More information

Appendix C DNA Replication & Mitosis

Appendix C DNA Replication & Mitosis K.Muma Bio 6 Appendix C DNA Replication & Mitosis Study Objectives: Appendix C: DNA replication and Mitosis 1. Describe the structure of DNA and where it is found. 2. Explain complimentary base pairing:

More information

Biology 3A Laboratory MITOSIS Asexual Reproduction

Biology 3A Laboratory MITOSIS Asexual Reproduction Biology 3A Laboratory MITOSIS Asexual Reproduction OBJECTIVE To study the cell cycle and understand how, when and why cells divide. To study and identify the major stages of cell division. To relate the

More information

CCR Biology - Chapter 5 Practice Test - Summer 2012

CCR Biology - Chapter 5 Practice Test - Summer 2012 Name: Class: Date: CCR Biology - Chapter 5 Practice Test - Summer 2012 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. If a cell cannot move enough material

More information

CELL DIVISION. STAGES OF MITOTIC DIVISION (Diag. C1)

CELL DIVISION. STAGES OF MITOTIC DIVISION (Diag. C1) 1 CELL DIVISION Cell division is the process by which cells replicate in order to replace cell loss, repair tissue damage and reproduce the organism. Two types of cell division are encountered in the Eukaryotic

More information

Science 10-Biology Activity 14 Worksheet on Sexual Reproduction

Science 10-Biology Activity 14 Worksheet on Sexual Reproduction Science 10-Biology Activity 14 Worksheet on Sexual Reproduction 10 Name Due Date Show Me NOTE: This worksheet is based on material from pages 367-372 in Science Probe. 1. Sexual reproduction requires parents,

More information

The illustrations below reflect other scientists results in identifying and counting the stages of the onion root tip and the whitefish blastula.

The illustrations below reflect other scientists results in identifying and counting the stages of the onion root tip and the whitefish blastula. Abstract: The purpose of this laboratory experiment was to identify in what stage of mitosis viewed cells were in. The stages of mitosis include prophase, metaphase, anaphase and telophase. Although the

More information

CHAPTER 10 CELL CYCLE AND CELL DIVISION

CHAPTER 10 CELL CYCLE AND CELL DIVISION CHAPTER 10 CELL CYCLE AND CELL DIVISION Cell division is an inherent property of living organisms. It is a process in which cells reproduce their own kind. The growth, differentiation, reproduction and

More information

The Huntington Library, Art Collections, and Botanical Gardens

The Huntington Library, Art Collections, and Botanical Gardens The Huntington Library, Art Collections, and Botanical Gardens Rooting for Mitosis Overview Students will fix, stain, and make slides of onion root tips. These slides will be examined for the presence

More information

Sexual Reproduction. and Meiosis. Sexual Reproduction

Sexual Reproduction. and Meiosis. Sexual Reproduction Sexual Reproduction and Meiosis Describe the stages of meiosis and how sex cells are produced. Explain why meiosis is needed for sexual reproduction. Name the cells that are involved in fertilization.

More information

From DNA to Protein

From DNA to Protein Nucleus Control center of the cell contains the genetic library encoded in the sequences of nucleotides in molecules of DNA code for the amino acid sequences of all proteins determines which specific proteins

More information

Lecture 2: Mitosis and meiosis

Lecture 2: Mitosis and meiosis Lecture 2: Mitosis and meiosis 1. Chromosomes 2. Diploid life cycle 3. Cell cycle 4. Mitosis 5. Meiosis 6. Parallel behavior of genes and chromosomes Basic morphology of chromosomes telomere short arm

More information

Mitosis, Meiosis and Fertilization 1

Mitosis, Meiosis and Fertilization 1 Mitosis, Meiosis and Fertilization 1 I. Introduction When you fall and scrape the skin off your hands or knees, how does your body make new skin cells to replace the skin cells that were scraped off? How

More information

The Somatic Cell Cycle

The Somatic Cell Cycle The Somatic Cell Cycle Maternal chromosome Diploid Zygote Diploid Zygote Paternal chromosome MITOSIS MITOSIS Maternal chromosome Diploid organism Diploid organism Paternal chromosome Int terpha ase The

More information

Biology Behind the Crime Scene Week 4: Lab #4 Genetics Exercise (Meiosis) and RFLP Analysis of DNA

Biology Behind the Crime Scene Week 4: Lab #4 Genetics Exercise (Meiosis) and RFLP Analysis of DNA Page 1 of 5 Biology Behind the Crime Scene Week 4: Lab #4 Genetics Exercise (Meiosis) and RFLP Analysis of DNA Genetics Exercise: Understanding how meiosis affects genetic inheritance and DNA patterns

More information

Genetic Mutations. Indicator 4.8: Compare the consequences of mutations in body cells with those in gametes.

Genetic Mutations. Indicator 4.8: Compare the consequences of mutations in body cells with those in gametes. Genetic Mutations Indicator 4.8: Compare the consequences of mutations in body cells with those in gametes. Agenda Warm UP: What is a mutation? Body cell? Gamete? Notes on Mutations Karyotype Web Activity

More information

Guided Notes: Chapter 9 Cellular Reproduction

Guided Notes: Chapter 9 Cellular Reproduction Guided Notes: Cellular Reproduction When do cells divide? Cells grow and function normally until they become too. Cell size is because increases faster than This means that there is not enough area on

More information

Biology 1406 Exam 4 Notes Cell Division and Genetics Ch. 8, 9

Biology 1406 Exam 4 Notes Cell Division and Genetics Ch. 8, 9 Biology 1406 Exam 4 Notes Cell Division and Genetics Ch. 8, 9 Ch. 8 Cell Division Cells divide to produce new cells must pass genetic information to new cells - What process of DNA allows this? Two types

More information

Unit 1 Higher Human Biology Summary Notes

Unit 1 Higher Human Biology Summary Notes Unit 1 Higher Human Biology Summary Notes a. Cells tissues organs body systems Division of labour occurs in multicellular organisms (rather than each cell carrying out every function) Most cells become

More information

Classify chromosomes in a karyotype according to size and centromere position. Identify metacentric, submetacentric and acrocentric chromosomes

Classify chromosomes in a karyotype according to size and centromere position. Identify metacentric, submetacentric and acrocentric chromosomes Mitosis, Meiosis and the Cell Cycle Prof. Alfred Cuschieri University of Malta Department of Anatomy Objectives By the end of the session the student shoud be able to: Define the meaning of chromosomes

More information

BioSci 2200 General Genetics Problem Set 1 Answer Key Introduction and Mitosis/ Meiosis

BioSci 2200 General Genetics Problem Set 1 Answer Key Introduction and Mitosis/ Meiosis BioSci 2200 General Genetics Problem Set 1 Answer Key Introduction and Mitosis/ Meiosis Introduction - Fields of Genetics To answer the following question, review the three traditional subdivisions of

More information

Chromosomes, Karyotyping, and Abnormalities (Learning Objectives) Learn the components and parts of a metaphase chromosome.

Chromosomes, Karyotyping, and Abnormalities (Learning Objectives) Learn the components and parts of a metaphase chromosome. Chromosomes, Karyotyping, and Abnormalities (Learning Objectives) Learn the components and parts of a metaphase chromosome. Define the terms karyotype, autosomal and sex chromosomes. Explain how many of

More information

Cell Division and Mitosis DNA. Sexual Reproduction and Meiosis. 2. Meiosis occurs in the reproductive organs, producing four haploid sex cells.

Cell Division and Mitosis DNA. Sexual Reproduction and Meiosis. 2. Meiosis occurs in the reproductive organs, producing four haploid sex cells. ell Division and Mitosis 1. he life cycle of a cell has two parts growth and development, and cell division. 2. In mitosis, the nucleus divides to form two identical nuclei. Mitosis occurs in four continuous

More information

Mitosis in Onion Root Tip Cells

Mitosis in Onion Root Tip Cells Mitosis in Onion Root Tip Cells A quick overview of cell division The genetic information of plants, animals and other eukaryotic organisms resides in several (or many) individual DNA molecules, or chromosomes.

More information

Support structure for genetic material

Support structure for genetic material Support structure for genetic material 1 Making proteins in the RER Making copies of humans 2 Making copies of cells Making copies of genetic material 3 Making copies of genetic material Making copies

More information

Cell Division Simulation: Bacteria Activity One

Cell Division Simulation: Bacteria Activity One Cell Division Simulation: Bacteria Activity One Introduction All living things are made of cells. Some living things, like plants and animals, are made of millions of cells. But some living things are

More information

Test Two Study Guide

Test Two Study Guide Test Two Study Guide 1. Describe what is happening inside a cell during the following phases (pictures may help but try to use words): Interphase: : Consists of G1 / S / G2. Growing stage, cell doubles

More information

1 Mutation and Genetic Change

1 Mutation and Genetic Change CHAPTER 14 1 Mutation and Genetic Change SECTION Genes in Action KEY IDEAS As you read this section, keep these questions in mind: What is the origin of genetic differences among organisms? What kinds

More information

Sexual Reproduction and Meiosis

Sexual Reproduction and Meiosis 12 Sexual Reproduction and Meiosis Concept Outline 12.1 Meiosis produces haploid cells from diploid cells. Discovery of Reduction Division. Sexual reproduction does not increase chromosome number because

More information

AS Biology Unit 2 Key Terms and Definitions. Make sure you use these terms when answering exam questions!

AS Biology Unit 2 Key Terms and Definitions. Make sure you use these terms when answering exam questions! AS Biology Unit 2 Key Terms and Definitions Make sure you use these terms when answering exam questions! Chapter 7 Variation 7.1 Random Sampling Sampling a population to eliminate bias e.g. grid square

More information

The correct answer is c A. Answer a is incorrect. The white-eye gene must be recessive since heterozygous females have red eyes.

The correct answer is c A. Answer a is incorrect. The white-eye gene must be recessive since heterozygous females have red eyes. 1. Why is the white-eye phenotype always observed in males carrying the white-eye allele? a. Because the trait is dominant b. Because the trait is recessive c. Because the allele is located on the X chromosome

More information

LAB 09 Cell Division

LAB 09 Cell Division LAB 09 Cell Division Introduction: One of the characteristics of living things is the ability to replicate and pass on genetic information to the next generation. Cell division in individual bacteria and

More information

Respiration occurs in the mitochondria in cells.

Respiration occurs in the mitochondria in cells. B3 Question Which process occurs in the mitochondria in cells? Why do the liver and muscle cells have large number of mitochondria? What is the function of the ribosomes? Answer Respiration occurs in the

More information

12.1 The Role of DNA in Heredity

12.1 The Role of DNA in Heredity 12.1 The Role of DNA in Heredity Only in the last 50 years have scientists understood the role of DNA in heredity. That understanding began with the discovery of DNA s structure. In 1952, Rosalind Franklin

More information

Chapter 8: Variation in Chromosome Structure and Number

Chapter 8: Variation in Chromosome Structure and Number Chapter 8: Variation in Chromosome Structure and Number Student Learning Objectives Upon completion of this chapter you should be able to: 1. Know the principles and terminology associated with variations

More information

The Cell Cycle: A series of modeling activities

The Cell Cycle: A series of modeling activities The Cell Cycle: A series of modeling activities Cancer Education Project University of Rochester Premise: Students learn best when exposed to a variety of activities Overview 1. Information Gathering:

More information

Germ cell formation / gametogenesis And Fertilisation

Germ cell formation / gametogenesis And Fertilisation Developmental Biology BY1101 P. Murphy Lecture 3 The first steps to forming a new organism Descriptive embryology I Germ cell formation / gametogenesis And Fertilisation Why bother with sex? In terms of

More information

Cell Cycle in Onion Root Tip Cells (IB)

Cell Cycle in Onion Root Tip Cells (IB) Cell Cycle in Onion Root Tip Cells (IB) A quick overview of cell division The genetic information of plants, animals and other eukaryotic organisms resides in several (or many) individual DNA molecules,

More information

Heredity - Patterns of Inheritance

Heredity - Patterns of Inheritance Heredity - Patterns of Inheritance Genes and Alleles A. Genes 1. A sequence of nucleotides that codes for a special functional product a. Transfer RNA b. Enzyme c. Structural protein d. Pigments 2. Genes

More information

Chromosome Mapping Assignment INSTRUCTIONS

Chromosome Mapping Assignment INSTRUCTIONS INSTRUCTIONS PROCEDURE A: 1) Examine the diagram of perch chromosomes supplied. They have been removed from the nucleus of the white blood cell after replication. 2) Cut out each chromosome map of these

More information

Reproductive System & Development: Practice Questions #1

Reproductive System & Development: Practice Questions #1 Reproductive System & Development: Practice Questions #1 1. Which two glands in the diagram produce gametes? A. glands A and B B. glands B and E C. glands C and F D. glands E and F 2. Base your answer

More information

guides BIOLOGY OF AGING STEM CELLS An introduction to aging science brought to you by the American Federation for Aging Research

guides BIOLOGY OF AGING STEM CELLS An introduction to aging science brought to you by the American Federation for Aging Research infoaging guides BIOLOGY OF AGING STEM CELLS An introduction to aging science brought to you by the American Federation for Aging Research WHAT ARE STEM CELLS? Stem cells are cells that, in cell cultures

More information

Chromosomal Basis of Inheritance. Ch. 3

Chromosomal Basis of Inheritance. Ch. 3 Chromosomal Basis of Inheritance Ch. 3 THE CHROMOSOME THEORY OF INHERITANCE AND SEX CHROMOSOMES! The chromosome theory of inheritance describes how the transmission of chromosomes account for the Mendelian

More information

Given these characteristics of life, which of the following objects is considered a living organism? W. X. Y. Z.

Given these characteristics of life, which of the following objects is considered a living organism? W. X. Y. Z. Cell Structure and Organization 1. All living things must possess certain characteristics. They are all composed of one or more cells. They can grow, reproduce, and pass their genes on to their offspring.

More information

MITOSIS IN ONION ROOT TIP CELLS: AN INTRODUCTION TO LIGHT MICROSCOPY

MITOSIS IN ONION ROOT TIP CELLS: AN INTRODUCTION TO LIGHT MICROSCOPY MITOSIS IN ONION ROOT TIP CELLS: AN INTRODUCTION TO LIGHT MICROSCOPY Adapted from Foundations of Biology I; Lab 6 Introduction to Microscopy Dr. John Robertson, Westminster College Biology Department,

More information

Bio 101 Section 001: Practice Questions for First Exam

Bio 101 Section 001: Practice Questions for First Exam Do the Practice Exam under exam conditions. Time yourself! MULTIPLE CHOICE: 1. The substrate fits in the of an enzyme: (A) allosteric site (B) active site (C) reaction groove (D) Golgi body (E) inhibitor

More information

1. Identify each phase of mitosis on the onion root tip and the whitefish blastula. 3. Explain differences in mitosis between plant and animal cells.

1. Identify each phase of mitosis on the onion root tip and the whitefish blastula. 3. Explain differences in mitosis between plant and animal cells. Mitosis Objectives Having completed the lab on mitosis, you should be able to: 1. Identify each phase of mitosis on the onion root tip and the whitefish blastula. 2. Describe the events during each phase

More information

Name: Class: Date: ID: A

Name: Class: Date: ID: A Name: Class: _ Date: _ Meiosis Quiz 1. (1 point) A kidney cell is an example of which type of cell? a. sex cell b. germ cell c. somatic cell d. haploid cell 2. (1 point) How many chromosomes are in a human

More information

Teacher s Guide. Mitosis. Grades 5-9 MTTV

Teacher s Guide. Mitosis. Grades 5-9 MTTV Teacher s Guide Mitosis Grades 5-9 MTTV CREDITS Program Production Sunburst Visual Media Teacher s Guide Terry Gates Print Material Design Cecile Foshee 2004 Sunburst Visual Media, a division of Global

More information

Addition by Division TEACHER NOTES SCIENCE NSPIRED

Addition by Division TEACHER NOTES SCIENCE NSPIRED Science Objectives Students will identify the changes that occur in cells during each phase of the cell cycle. Students will correlate these changes to the duration of time cells spend in each phase. While

More information

Pre-lab homework Lab 2: Reproduction in Protists, Fungi, Moss and Ferns

Pre-lab homework Lab 2: Reproduction in Protists, Fungi, Moss and Ferns Pre-lab homework Lab 2: Reproduction in Protists, Fungi, Moss and Ferns Lab Section: Name: 1. Last week in lab you looked at the reproductive cycle of the animals. This week s lab examines the cycles of

More information

Sample Questions for Exam 3

Sample Questions for Exam 3 Sample Questions for Exam 3 1. All of the following occur during prometaphase of mitosis in animal cells except a. the centrioles move toward opposite poles. b. the nucleolus can no longer be seen. c.

More information

What are Stem Cells? How can they be used in medicine?

What are Stem Cells? How can they be used in medicine? What are Stem Cells? How can they be used in medicine? What is a stem cell????... What is a stem cell????......a cell with the ability to differentiate into specialized cells and renew to become more stem

More information

B2 5 Inheritrance Genetic Crosses

B2 5 Inheritrance Genetic Crosses B2 5 Inheritrance Genetic Crosses 65 minutes 65 marks Page of 55 Q. A woman gives birth to triplets. Two of the triplets are boys and the third is a girl. The triplets developed from two egg cells released

More information

Human Blood Types: Codominance and Multiple Alleles. Codominance: both alleles in the heterozygous genotype express themselves fully

Human Blood Types: Codominance and Multiple Alleles. Codominance: both alleles in the heterozygous genotype express themselves fully Human Blood Types: Codominance and Multiple Alleles Codominance: both alleles in the heterozygous genotype express themselves fully Multiple alleles: three or more alleles for a trait are found in the

More information

CHROMOSOMES Dr. Fern Tsien, Dept. of Genetics, LSUHSC, NO, LA

CHROMOSOMES Dr. Fern Tsien, Dept. of Genetics, LSUHSC, NO, LA CHROMOSOMES Dr. Fern Tsien, Dept. of Genetics, LSUHSC, NO, LA Cytogenetics is the study of chromosomes and their structure, inheritance, and abnormalities. Chromosome abnormalities occur in approximately:

More information

The Developing Person Through the Life Span 8e by Kathleen Stassen Berger

The Developing Person Through the Life Span 8e by Kathleen Stassen Berger The Developing Person Through the Life Span 8e by Kathleen Stassen Berger Chapter 3 Heredity and Environment PowerPoint Slides developed by Martin Wolfger and Michael James Ivy Tech Community College-Bloomington

More information

02-SciProbe9-Chap02 2/8/07 12:12 PM Page 32 32 NEL

02-SciProbe9-Chap02 2/8/07 12:12 PM Page 32 32 NEL 32 UNIT A REPRODUCTION Chapter 2 Cell Growth and Reproduction Chapter 3 Sexual Reproduction Chapter 4 Human Reproduction Unit Preview Your body is made of many trillions of cells that came from a single

More information

Genetic material of all living organisms. Biology - 100

Genetic material of all living organisms. Biology - 100 Genetic material of all living organisms. Biology - 100 This antibiotic is made from a fungus that was first discovered growing on an orange and it became the first antibiotic to treat infection. Biology

More information

Each person normally has 23 pairs of chromosomes, or 46 in all. We inherit one chromosome per pair from our mother and one from our father.

Each person normally has 23 pairs of chromosomes, or 46 in all. We inherit one chromosome per pair from our mother and one from our father. AP Psychology 2.2 Behavioral Genetics Article Chromosomal Abnormalities About 1 in 150 babies is born with a chromosomal abnormality (1, 2). These are caused by errors in the number or structure of chromosomes.

More information

How Cancer Begins???????? Chithra Manikandan Nov 2009

How Cancer Begins???????? Chithra Manikandan Nov 2009 Cancer Cancer is one of the most common diseases in the developed world: 1 in 4 deaths are due to cancer 1 in 17 deaths are due to lung cancer Lung cancer is the most common cancer in men Breast cancer

More information

CHAPTER 2: UNDERSTANDING CANCER

CHAPTER 2: UNDERSTANDING CANCER CHAPTER 2: UNDERSTANDING CANCER INTRODUCTION We are witnessing an era of great discovery in the field of cancer research. New insights into the causes and development of cancer are emerging. These discoveries

More information

LABORATORY 2 THE CELL CYCLE AND THE STAGES OF MITOSIS LEARNING OBJECTIVES AFTER COMPLETING THIS LABORATORY, YOU SHOULD BE ABLE TO:

LABORATORY 2 THE CELL CYCLE AND THE STAGES OF MITOSIS LEARNING OBJECTIVES AFTER COMPLETING THIS LABORATORY, YOU SHOULD BE ABLE TO: LABORATORY 2 THE CELL CYCLE AND THE STAGES OF MITOSIS LEARNING OBJECTIVES AFTER COMPLETING THIS LABORATORY, YOU SHOULD BE ABLE TO: 1. Describe the cell cycle. 2. Identify stages of mitosis from prepared

More information

Class Time: 30 minutes. Other activities in the Stem Cells in the Spotlight module can be found at: http://gslc.genetics.utah.edu/teachers/tindex/

Class Time: 30 minutes. Other activities in the Stem Cells in the Spotlight module can be found at: http://gslc.genetics.utah.edu/teachers/tindex/ Teacher Guide: Color-Label-Learn: Creating Stem Cells for Research ACTIVITY OVERVIEW Abstract: Students color and label images on a worksheet and answer questions about the on-line content featured in

More information

The chromosomes are structures in living cells that contain

The chromosomes are structures in living cells that contain Brooker Widmaier Graham Stiling: III. Nucleic Acid Structure and DNA Replication 15. Eukaryotic Chromosomes, Mitosis, 47 EUKARYOTIC CHROMOSOMES, MITOSIS, AND MEIOSIS C HAPTER O UTLINE 15.1 Molecular Structure

More information

CHROMOSOMES AND INHERITANCE

CHROMOSOMES AND INHERITANCE SECTION 12-1 REVIEW CHROMOSOMES AND INHERITANCE VOCABULARY REVIEW Distinguish between the terms in each of the following pairs of terms. 1. sex chromosome, autosome 2. germ-cell mutation, somatic-cell

More information

Sex for the purposes of this class refers to 4 components

Sex for the purposes of this class refers to 4 components Sex for the purposes of this class refers to 4 components Gonadal sex Gonads or where gametes are produced by meiosis Somatic sex Somatic cells are cells that undergo mitosis. They can be divided into

More information

MCAS Biology. Review Packet

MCAS Biology. Review Packet MCAS Biology Review Packet 1 Name Class Date 1. Define organic. THE CHEMISTRY OF LIFE 2. All living things are made up of 6 essential elements: SPONCH. Name the six elements of life. S N P C O H 3. Elements

More information

What is Cancer? Cancer is a genetic disease: Cancer typically involves a change in gene expression/function:

What is Cancer? Cancer is a genetic disease: Cancer typically involves a change in gene expression/function: Cancer is a genetic disease: Inherited cancer Sporadic cancer What is Cancer? Cancer typically involves a change in gene expression/function: Qualitative change Quantitative change Any cancer causing genetic

More information

Chromosomes, Mapping, and the Meiosis Inheritance Connection

Chromosomes, Mapping, and the Meiosis Inheritance Connection Chromosomes, Mapping, and the Meiosis Inheritance Connection Carl Correns 1900 Chapter 13 First suggests central role for chromosomes Rediscovery of Mendel s work Walter Sutton 1902 Chromosomal theory

More information

Stem Cell Quick Guide: Stem Cell Basics

Stem Cell Quick Guide: Stem Cell Basics Stem Cell Quick Guide: Stem Cell Basics What is a Stem Cell? Stem cells are the starting point from which the rest of the body grows. The adult human body is made up of hundreds of millions of different

More information

AP BIOLOGY 2012 SCORING GUIDELINES

AP BIOLOGY 2012 SCORING GUIDELINES AP BIOLOGY 2012 SCORING GUIDELINES Question 1 Note: At least 1 point must be earned from each of parts (a), (b), (c), and (d) in order to earn a maximum score of 10. The ability to reproduce is a characteristic

More information

(http://www.nap.edu/catalog.php?record_id=13165 ).

(http://www.nap.edu/catalog.php?record_id=13165 ). Mitosis, Meiosis and Fertilization Teacher Preparation Notes By Drs. Ingrid Waldron, Jennifer Doherty, cott Poethig and Lori pindler,. Department of Biology, University of Pennsylvania, 2014 1 In this

More information

Basic Biological Principles Module A Anchor 1

Basic Biological Principles Module A Anchor 1 Basic Biological Principles Module A Anchor 1 Key Concepts: - Living things are made of units called cells, are based on a universal genetic code, obtain and use materials and energy, grow and develop,

More information

Look for these related items from Learning Resources :

Look for these related items from Learning Resources : Look for these related items from Learning Resources : LER 1901 Cross Section Plant Cell LER 1902 Cross Section Heart Model LER 1903 Cross Section Brain Model LER 2437 Cross Section Earth Model For a dealer

More information

Stem Cells. Part 1: What is a Stem Cell?

Stem Cells. Part 1: What is a Stem Cell? Stem Cells Part 1: What is a Stem Cell? Stem cells differ from other kinds of cells in the body. When a stem cell divides by mitosis, each new cell has the potential to either remain a stem cell or become

More information