Mendelian Genetics and Inheritance Problems

Size: px
Start display at page:

Download "Mendelian Genetics and Inheritance Problems"

Transcription

1 Biology 211 Mendelian Genetics and Inheritance Problems Mendel discovered and described many of the basic rules of genetics after studying the pattern of how inheritable traits were passed from generation to generation in pea plants. His approach was mathematical. He made various crosses, counted the number of offspring with the different traits and described several Laws/Principles that would account for the ratios he saw in his results. 1) When Mendel crossed true breeding, purple-flowered pea plants with true-breeding, white flowered plants the offspring (F 1 ) generation all had purple flowers. When he let this generation self itself and counted the flowers in the next (F 2 ) generation, he found 705 plants had purple flowers and 224 had white flowers (approximately a 3:1 ratio). Use a Punnet square to show why one would expect a 3:1 ratio if crossing purple and white flowers. Which color is dominant, purple or white? 2) You cross a heterozygous purple-flowered pea plant with a white-flowered plant and counted 800 seeds. Approximately how many of those 800 would you expect to grow into white-flowered plants? 3) What were the genotypes (represent the dominant allele with an A and the recessive allele with an a) of the parents in a cross that produced: a) ½ dominant phenotype and ½ recessive phenotype progeny b) all heterozygous progeny c) ¾ dominant phenotype and ¼ recessive phenotype progeny 1

2 4) Cystic fibrosis is a genetic disease that causes bronchial mucus to be very thick. People with cystic fibrosis usually die of pneumonia or other respiratory tract infection by the their mid-20 s. Two parents, neither of whom have cystic fibrosis, give birth to a son with cystic fibrosis. Is cystic fibrosis dominant or recessive? What are the genotypes of the parents? (Cystic fibrosis is not sex-linked.) 5) Huntington's Disease, a rare, lethal, degenerative disease of the nervous system is caused by a dominant allele. This disease does not show symptoms until a person is about 45 to 55 years old. A 50-year-old man has just been diagnosed with Huntinton's disease. He wants to know what are the chances that any of his children have inherited the disease. As his doctor, what do you tell him? Mendel worked with many characteristics (genes) in his crosses. This led to his Law of Independent Assortment. 6) List all the possible gametes that a purple flowered, yellow, round seeded pea plant can produce if it is heterozygous for those characteristics. (These characteristics assort independently.) 7) Assuming complete dominance, what would be the ratio of the phenotypes of the offspring of selfing a plant that was heterozygous for tall plants (tall is dominant) with purple flowers (purple is dominant over white). 2

3 Not all traits can be explained by classic Mendelian patterns of inheritance. For example not all alleles are dominant or recessive, but instead show incomplete or codominance. In these instances a cross between two true-breeding plants will result in a phenotype that is either intermediate between the two original phenotypes (incomplete dominance) or both phenotypes will be visible in the offspring (co-dominance). 8) In snap-dragons red is not dominant to white in flower color but instead heterozygotes are pink. What would be the result of crossing a pure-breeding (homozygous) snapdragon with red flowers with a pure-breeding white-flowered plant? Show the genotypes and then describe what the plant would look like. Also all the characteristics that Mendel examined had only two alleles. His flowers were either purple or white, his seeds were either wrinkled or round, plants tall or short, etc. In many instances there are more than two alleles in the population, still any person can only have two versions since they only have two sets of chromosomes. 9) The ABO blood types are a classic case where there are three alleles of the gene, I A, I B and i. A person with A blood has either I A I A or I A i, a person with type B blood has I B I B or I B i, and a person with type O blood has two copies of the i i allele. Blood typing is often used in cases where one wants to determine whether an individual could be the parent of another individual. What are the possible blood types of children of a mother with AB blood and a father with O blood? Which two alleles of this blood type gene are codominant and which allele is recessive? 10) Color pattern in a species of duck is determined by one gene with three alleles. Alleles H and I are codominant, and allele i is recessive to both. How many phenotypes are possible in a population of ducks (ducks are diploid) that contains all the possible combinations of these alleles? 3

4 Mendel did not examine sex-linked traits. These are traits that are found on the X or Y chromosomes. Sex-linked traits show different patterns of inheritance than normal traits because males have one X and one Y chromosome while females have two X chromosomes. Of course, females do not show traits that are only coded for on the Y chromsome. 11) Hemophilia is inherited as an X-linked recessive in humans. A normal woman and a normal man have a male child who has hemophilia. What are the genotypes of the parents? What is the chance any subsequent male children will have hemophilia? What percentage of their daughters will be carriers? Even though Mendel s dihybrid crosses showed Independent Assortment of his traits (genes), many traits do not. If a dihybrid cross is performed some traits will give ratios that show dependent assortment (i.e. the traits are linked, close to each other on the same chromosome) while other traits will give ratios that can not be explained by either dependent or independent assortment (due to crossing-over). 12) In hephalumps, the gene for number of lumps is completely linked to the gene for webbed toes. Lumps (L) is dominant to having no lumps and webbed toes (T) is dominant to non-webbed toes. If a homozygous dominant hephalump mated with a homozygous recessive hephalump what would be the genotype and phenotype of their offspring? Please write the possible gametes that this individual, the F 1 offspring hephalump can produce. If those genes were NOT linked, i.e., showed independent assortment, what types of gametes could the F 1 individual produce? 4

5 14) In barflies, the gene for glassy eyes is completely linked to the gene for red nose. Each of these traits is recessive to the normal alleles. If a true-breeding, glassy-eyed, normal-nosed female is crossed with a true-breeding, normal-eyed, red-nosed male, and their F 1 progeny are mated with each other, what is the expected phenotypic ratio of the F 2 progeny? Look at the following family pedigrees and determine the most likely mode of inheritance for each one (i.e., dominant, recessive, X-linked dominant, X-linked recessive). Where possible fill in the genotypes of family members. If you can only determine one of the alleles just write that one allele down and leave a question mark for the second allele. Squares = male, circle= female. HINTS for doing pedigree analysis problems: 1) Check to see if the trait is equally distributed between males and females. If there are more males affected you should look to see if the trait is sex-linked. If it is passing from father to sons it must be Y-linked. More commonly it is passing from the mother to sons (and daughters) and is X-linked. 2) Check to see if the trait shows up in every generation. If the trait is skipping generations it may be recessive. 3) If the trait shows up every generation, it can be dominant or it can be recessive. Often several options work. If they do, check to see what pattern of inheritance is best supported by the ratio of the offspring. If additional information has been given in the question, use that information. For example if you are told the trait is rare, it is unlikely anyone has two alleles for that trait. 5

6 6

Answers to Mendelian genetics questions BI164 Spring, 2007

Answers to Mendelian genetics questions BI164 Spring, 2007 Answers to Mendelian genetics questions BI164 Spring, 2007 1. The father has normal vision and must therefore be hemizygous for the normal vision allele. The mother must be a carrier and hence the source

More information

Genetics Problem Set

Genetics Problem Set AP Biology Name: Genetics Problem Set Independent Assortment Problems 1. One gene has alleles A and a. Another has alleles B and b. For each genotype listed, what type(s) of gametes will be produced? (Assume

More information

Lesson #1.7-Incomplete Dominance Codominance Dihybrid Crosses

Lesson #1.7-Incomplete Dominance Codominance Dihybrid Crosses Lesson #1.7-Incomplete Dominance Codominance Dihybrid Crosses Exceptions to Mendel s principles So far, offspring have either the phenotype of one parent or the other. Sometimes, there is no dominant or

More information

BIOLOGY I Study Guide # 5: Topic Genetics 1

BIOLOGY I Study Guide # 5: Topic Genetics 1 BIOLOGY I Study Guide # 5: Topic Genetics 1 Biology Textbook pg. 262 285, 340-365 Name: I. Mendelian Genetics (pg. 263 272) Define: a. genetics: b. fertilization: c. true-breeding: d. trait: e. hybrid:

More information

Mendel & the Gene Idea, Part II

Mendel & the Gene Idea, Part II Mendel & the Gene Idea, Part II Chapter 4, pp. 262-285 Lecture Outline Laws of probabilities govern Mendelian inheritance Beyond Mendel complex inheritance patterns Incomplete dominance Codominance and

More information

Biology 3 Mendelian Inheritance (CH 7)

Biology 3 Mendelian Inheritance (CH 7) Biology 3 Mendelian Inheritance (CH 7) Dr. Terence Lee Genetics Genetics 1 2.20 DNA holds the genetic information to build an organism. 2.21 RNA is a universal translator, reading DNA and directing protein

More information

CHAPTER : Beyond Mendelian Genetics

CHAPTER : Beyond Mendelian Genetics CHAPTER 12.2 12.6: Beyond Mendelian Genetics Incomplete Dominance 1. In radishes, the gene that controls color exhibits incomplete dominance. Pure-breeding red radishes crossed with pure-breeding white

More information

Genetics. The connection between Gene expression and Genetics. Genotype is the genetic make up of an organism (gene), which codes for a protein.

Genetics. The connection between Gene expression and Genetics. Genotype is the genetic make up of an organism (gene), which codes for a protein. Genetics The connection between Gene expression and Genetics Genotype is the genetic make up of an organism (gene), which codes for a protein. The protein has a specific function which produces a trait.

More information

Foundations of Genetics. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display

Foundations of Genetics. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display Foundations of Genetics 8.1 Mendel and the Garden Pea The tendency for traits to be passed from parent to offspring is called heredity Gregor Mendel (1822-1884) The first person to systematically study

More information

Multiple Choice Review Mendelian Genetics & Inheritance Patterns

Multiple Choice Review Mendelian Genetics & Inheritance Patterns Multiple Choice Review Mendelian Genetics & 1. Jean-Baptiste Lamarck introduced a theory about inheritance in the early 1800s. Which of the following accurately describes his Theory of Acquired Characteristics?

More information

BISC403 Genetic and Evolutionary Biology Spring 2011

BISC403 Genetic and Evolutionary Biology Spring 2011 BISC403 Genetic and Evolutionary Biology Spring 2011 February 22, 2011 Summary of requirements for Exam 1 (to be given on March 1) plus first exam from fall of 2010 The primary responsibility is for any

More information

Genetics Exam Review Questions

Genetics Exam Review Questions Name: Date: Genetics Exam Review Questions Multiple Choice: Select the best answer to complete each statement. 1. Mendel crossed pea plants with greens seeds (yy) with plants with yellow seeds (YY). The

More information

Fundamentals of Genetics. Chapter 9

Fundamentals of Genetics. Chapter 9 Fundamentals of Genetics Chapter 9 Heredity: the transmission of genetic information from one generation to the next. Genes: Provide continuity between generations that is essential for life Control to

More information

Single-Gene Inheritance (Learning Objectives) Review the presence of homologous chromosomes in diploid organisms that reproduce sexually, the

Single-Gene Inheritance (Learning Objectives) Review the presence of homologous chromosomes in diploid organisms that reproduce sexually, the Single-Gene Inheritance (Learning Objectives) Review the presence of homologous chromosomes in diploid organisms that reproduce sexually, the definitions of karyotype, autosomes and sex chromosomes. Recognize

More information

Ch.12 Reading and Concept Review Packet /20

Ch.12 Reading and Concept Review Packet /20 Name: Period: Date: Ch.12 Reading and Concept Review Packet /20 Term Chapter 12 Reading and Concept Review: page 308-333. Directions: Link the various terms into coherent sentence or two that connects

More information

2. Which hereditary rule explains why a self-fertilizing parent that is heterozygous for the A locus (Aa) can produce offspring that are AA or aa?

2. Which hereditary rule explains why a self-fertilizing parent that is heterozygous for the A locus (Aa) can produce offspring that are AA or aa? Heredity 1. Technology Enhanced Questions are not available in Word format. 2. Which hereditary rule explains why a self-fertilizing parent that is heterozygous for the A locus (Aa) can produce offspring

More information

Genetics Worksheet. Name

Genetics Worksheet. Name Genetics Worksheet Name Section A: Vocabulary 1. Identify if the alleles are homozygous (Ho) or heterozygous (He). a. DD c. Yy e. Ee b. Tt d. hh f. KK 2. For each genotype below, determine the phenotype.

More information

Opening Activity: Latin Root Word: Review of Old Information:

Opening Activity: Latin Root Word: Review of Old Information: Section: 3.4 Opening Activity: Latin Root Word: Review of Old Information: Name: 1. In seals, the allele for long whiskers (L) is dominant and the allele for short whiskers (l) is recessive. What are the

More information

Definition/Example Signature

Definition/Example Signature Engage: Who Remembers? Instructions: Discuss the following terms with other students. Try to find someone who can explain the term to you or give you an example of the term. Record the definition or example

More information

Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many

Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many alleles control the trait. Below are different ways in which

More information

Chapter 24 Genetics and Genomics

Chapter 24 Genetics and Genomics Chapter 24 Genetics and Genomics Genetics study of inheritance of characteristics Genome complete set of genetic instructions Genomics field in which the body is studied in terms of multiple, interacting

More information

Heredity. Sarah crosses a homozygous white flower and a homozygous purple flower. The cross results in all purple flowers.

Heredity. Sarah crosses a homozygous white flower and a homozygous purple flower. The cross results in all purple flowers. Heredity 1. Sarah is doing an experiment on pea plants. She is studying the color of the pea plants. Sarah has noticed that many pea plants have purple flowers and many have white flowers. Sarah crosses

More information

Biology 160 Lab Module 12 Mendelian Genetics

Biology 160 Lab Module 12 Mendelian Genetics BIOL& 160 Clark College 1 Biology 160 Lab Module 12 Mendelian Genetics Name Learning Outcomes Upon successful completion of this lab, you should be able to: 1. Understand character inheritance, allelic

More information

3. If a heterozygous fire-breathing dragon is crossed with one that does not breathe fire, how many offspring will be fire breathers?

3. If a heterozygous fire-breathing dragon is crossed with one that does not breathe fire, how many offspring will be fire breathers? Mrs. Davisson Name Chapter 11: Genetics Per. Row Part I. Monohybrid Crosses - Complete Dominance For each of the following genetics problems, follow these steps in reaching a complete answer: Show all

More information

Biology Chapter 7 Beyond Mendel Notes

Biology Chapter 7 Beyond Mendel Notes Biology Chapter 7 Beyond Mendel Notes Phenotype: Genotype: What is Mendelian inheritance controlled by? Incomplete Dominance:. Example of Incomplete Dominance: Example Number 2 When green betta fish (B

More information

7A The Origin of Modern Genetics

7A The Origin of Modern Genetics Life Science Chapter 7 Genetics of Organisms 7A The Origin of Modern Genetics Genetics the study of inheritance (the study of how traits are inherited through the interactions of alleles) Heredity: the

More information

Chapter 11 Genetics. STATE FRAMEWORKS 3. Genetics

Chapter 11 Genetics. STATE FRAMEWORKS 3. Genetics STATE FRAMEWORKS 3. Genetics Chapter 11 Genetics Central Concepts: Genes allow for the storage and transmission of genetic information. They are a set of instructions encoded in the nucleotide sequence

More information

GENETICS PROBLEMS Genetics Problems Lab 17-1

GENETICS PROBLEMS Genetics Problems Lab 17-1 GENETICS PROBLEMS Introduction: One of the facts of life involves the different types of offspring that can be produced as a result of sexual reproduction. Offspring may have traits of one parent, both

More information

AP Biology Genetics Problems Practice

AP Biology Genetics Problems Practice AP Biology Genetics Problems Practice Name: Date: Period: Terms and Basics 1. Mendel proposed Three Laws of Genetics. They are: a. Independent Assortment, Relativity, Natural Selection b. Dominance, Allelic

More information

Science 103: Practice Questions for Exam 3

Science 103: Practice Questions for Exam 3 Science 103: Practice Questions for Exam 3 SHORT ANSWER QUESTIONS: 1. An individual lost his father to Huntington s disease. His mother is healthy and in her 60 s. (a) What is the probability that the

More information

LESSON #1.8: SEX-LINKED TRAITS, PEDIGREE CHARTS, MULTIPLE ALLELES

LESSON #1.8: SEX-LINKED TRAITS, PEDIGREE CHARTS, MULTIPLE ALLELES LESSON #1.8: SEX-LINKED TRAITS, PEDIGREE CHARTS, MULTIPLE ALLELES PART A: SEX-LINKED TRAITS Sex-linked traits are controlled by genes located on the sex chromosomes. A recessive trait located on the X

More information

Genetics. The study of heredity. discovered the. Gregor Mendel (1860 s) garden peas.

Genetics. The study of heredity. discovered the. Gregor Mendel (1860 s) garden peas. GENETICS Genetics The study of heredity. Gregor Mendel (1860 s) discovered the fundamental principles of genetics by breeding garden peas. Genetics Alleles 1. Alternative forms of genes. 2. Units that

More information

2. In humans, brown eye color (B) is dominant over blue eye color (b). What are the phenotypes of the following genotypes? A. BB B. bb C.

2. In humans, brown eye color (B) is dominant over blue eye color (b). What are the phenotypes of the following genotypes? A. BB B. bb C. Name: Period: Genetics Packet The Basics 1. The following pairs of letters represent alleles of different genotypes. Indicate which pairs are Heterozygous and which are Homozygous. Also indicate whether

More information

INHERITANCE & VARIATION 22 APRIL 2015 Section A: Summary Content Notes

INHERITANCE & VARIATION 22 APRIL 2015 Section A: Summary Content Notes INHERITANCE & VARIATION 22 APRIL 2015 Section A: Summary Content Notes Monohybrid Crosses Incomplete Dominance and Co-dominance Incomplete dominance: when the dominant gene allele is not able to completely

More information

2. For example, tall plant, round seed, violet flower, etc. are dominant characters in a pea plant.

2. For example, tall plant, round seed, violet flower, etc. are dominant characters in a pea plant. Principles of Inheritance and Variation Class 12 Chapter 5 Principles of Inheritance and Variation Exercise Solutions Exercise : Solutions of Questions on Page Number : 93 Q1 : Mention the advantages of

More information

Solutions to Genetics Problems

Solutions to Genetics Problems Solutions to Genetics Problems This chapter is much more than a solution set for the genetics problems. ere you will find details concerning the assumptions made, the approaches taken, the predictions

More information

Genetic Problems (I) SINGLE GENE INHERITANCE

Genetic Problems (I) SINGLE GENE INHERITANCE Genetic Problems (I) SINGLE GENE INHERITANCE 1. What are the expected phenotypic and genotypic ratios in the F1 generation? a. P= Pure bred black mated with white b. P= Hybrid black mated with white c.

More information

Name: Period: Genetics Problems

Name: Period: Genetics Problems Name: Period: Genetics Problems Basics 1. The following pairs of letters represent alleles of different genotypes. Indicate which pairs are Heterozygous and which are Homozygous. Also indicate whether

More information

A. Multiple alleles B. Polygenic traits C. Incomplete dominance D. Autosomal inheritance

A. Multiple alleles B. Polygenic traits C. Incomplete dominance D. Autosomal inheritance 1. When neither allele is dominant, so that a heterzygote has a phenotype that is a blending of each of the homozygous phenotypes (such as one red color allele and one white color allele producing pink

More information

Chapter 2: Traits and How They Change

Chapter 2: Traits and How They Change Table of Contents Chapter 2: Traits and How They Change Section 2: Genetics Heredity x Genetics Mendel s experiments Punnett Square REVIEW: Genes are sections of DNA Genes have different Alleles A gene

More information

Directed Reading B. Section: Traits and Inheritance A GREAT IDEA

Directed Reading B. Section: Traits and Inheritance A GREAT IDEA Skills Worksheet Directed Reading B Section: Traits and Inheritance A GREAT IDEA 1. What is the ratio that Mendel found for dominant to recessive traits? a. 1 to 1 c. 3 to 1 b. 2 to 1 d. 4 to 1 2. What

More information

Multiple Choice Review - Heredity

Multiple Choice Review - Heredity Questions #1-3 refer to the following situation: Multiple Choice Review - Heredity In humans, detached earlobes (D) is dominant to attached earlobes (d). Alison and her father have attached earlobes. Her

More information

Genetics Packet ~ Punnett Square Practice KEY

Genetics Packet ~ Punnett Square Practice KEY Basics Name: Date: Block: Genetics Packet ~ Punnett Square Practice KEY 1. The following pairs of letters represent alleles of different genotypes. Indicate which pairs are Heterozygous and which are Homozygous.

More information

CIBI Midterm Examination III November 2005

CIBI Midterm Examination III November 2005 Name: CIBI3031-070 Midterm Examination III November 2005 Multiple Choice In each blank, identify the letter of the choice that best completes the statement or answers the question. 1. If a parent cell

More information

Name Date Period. Review on Incomplete Dominance/ Codominance and Multiple Alleles

Name Date Period. Review on Incomplete Dominance/ Codominance and Multiple Alleles Pollen Name DatePeriod Review on Incomplete Dominance/ Codominance and Multiple Alleles 1. In snapdragon flowers, the red (C R ) and white (C W ) flower color alleles exhibit incomplete dominance. Flowers

More information

Name Date Period. Genetics Review

Name Date Period. Genetics Review Name Date Period Genetics Review MULTIPLE CHOICE: Circle the answer that best completes the sentence. The Austrian monk whose experiments with pea plants were the beginning of our understanding of genetics

More information

Copyright 2014 Edmentum - All rights reserved.

Copyright 2014 Edmentum - All rights reserved. Biology Heredity Blizzard Bag 2014-2015 Copyright 2014 Edmentum - All rights reserved. 1. Many serious diseases can be passed from parent to offspring through genes. In which case given below is a recessive

More information

Punnett Square: Monohybird Crosses

Punnett Square: Monohybird Crosses Punnett Squares A Punnett square is a mathematical device used by geneticists to show combinations of gametes and to predict offspring ratios. There are a few fundamental concepts of Punnett squares that

More information

7.013 Problem Set 1 Solutions

7.013 Problem Set 1 Solutions MIT Department of Biology 7.013: Introductory Biology - Spring 2004 Instructors: Professor Hazel Sive, Professor Tyler Jacks, Dr. Claudette Gardel NAME TA Section # 7.013 Problem Set 1 Solutions FRIDAY

More information

Name: 4. A typical phenotypic ratio for a dihybrid cross is a) 9:1 b) 3:4 c) 9:3:3:1 d) 1:2:1:2:1 e) 6:3:3:6

Name: 4. A typical phenotypic ratio for a dihybrid cross is a) 9:1 b) 3:4 c) 9:3:3:1 d) 1:2:1:2:1 e) 6:3:3:6 Name: Multiple-choice section Choose the answer which best completes each of the following statements or answers the following questions and so make your tutor happy! 1. Which of the following conclusions

More information

Chapter 18. Genes and Medical Genetics

Chapter 18. Genes and Medical Genetics 1 Chapter 18 Genes and Medical Genetics 2 1 Outline Genotype vs. Phenotype Dominant vs. Recessive Traits Punnett Squares Autosomal Recessive Disorders Autosomal Dominant Disorders Pedigree Charts Multiple

More information

Mendelian and Non-Mendelian Heredity Grade Ten

Mendelian and Non-Mendelian Heredity Grade Ten Ohio Standards Connection: Life Sciences Benchmark C Explain the genetic mechanisms and molecular basis of inheritance. Indicator 6 Explain that a unit of hereditary information is called a gene, and genes

More information

A trait is a variation of a particular character (e.g. color, height). Traits are passed from parents to offspring through genes.

A trait is a variation of a particular character (e.g. color, height). Traits are passed from parents to offspring through genes. 1 Biology Chapter 10 Study Guide Trait A trait is a variation of a particular character (e.g. color, height). Traits are passed from parents to offspring through genes. Genes Genes are located on chromosomes

More information

Problem Set 4 BILD10 / Winter 2014

Problem Set 4 BILD10 / Winter 2014 1) The DNA in linear eukaryotic chromosomes is wrapped around proteins called, which keep the DNA from getting tangled and enable an orderly, tight, and efficient packing of the DNA inside the cell. A)

More information

Genetics Practice. 1. The diagram below shows the chromosomes from a cell after they were photographed under a microscope.

Genetics Practice. 1. The diagram below shows the chromosomes from a cell after they were photographed under a microscope. Name: Date: 1. The diagram below shows the chromosomes from a cell after they were photographed under a microscope. Which of the following questions may best be answered by studying an organism s chromosomes?.

More information

c. Law of Independent Assortment: Alleles separate and do not have an effect on another allele.

c. Law of Independent Assortment: Alleles separate and do not have an effect on another allele. Level Genetics Review KEY Describe the 3 laws that Gregor Mendel established after working with pea plants. a. Law of Dominance: states that the effect of a recessive allele is not observed when a dominant

More information

Mendelian Genetics. Lab Exercise 13. Contents. Objectives. Introduction

Mendelian Genetics. Lab Exercise 13. Contents. Objectives. Introduction Lab Exercise Mendelian Genetics Contents Objectives 1 Introduction 1 Activity.1 Forming Gametes 2 Activity.2 Monohybrid Cross 3 Activity.3 Dihybrid Cross 4 Activity.4 Gene Linkage 5 Resutls Section 8 Objectives

More information

REVIEW OF GENETIC CROSSES

REVIEW OF GENETIC CROSSES REVIEW OF GENETIC CROSSES COMPLETE DOMINANCE - MONOHYBRID / ONE-TRAIT CROSSES 1. In pea plants, round seeds (R) are completely dominant to wrinkled seeds (r). In a genetic cross of two plants that are

More information

Section 1 Chromosomes and Inheritance. Section 2 Human Genetics. Resources

Section 1 Chromosomes and Inheritance. Section 2 Human Genetics. Resources How to Use This Presentation To View the presentation as a slideshow with effects select View on the menu bar and click on Slide Show. To advance through the presentation, click the right-arrow key or

More information

PSI Biology Mendelian Genetics & Inheritance Patterns

PSI Biology Mendelian Genetics & Inheritance Patterns Mendelian Genetics & Mendelian Genetics Classwork 1. Sexual reproduction takes a very significant toll on those species that utilize this process. What is the benefit that sexual reproduction offers for

More information

4.6 Dihybrid Crosses. offspring produced from such a cross are heterozygous for both the yellow and round genotypes. YYRR. YR YR yr.

4.6 Dihybrid Crosses. offspring produced from such a cross are heterozygous for both the yellow and round genotypes. YYRR. YR YR yr. (a) Indicate the genotypes and phenotypes of the F generation from the mating of a heterozygous Himalayan rabbit with an albino rabbit. (b) The mating of a full-coloured rabbit with a light-grey rabbit

More information

Chapter 11. Classical (Mendelian) Genetics

Chapter 11. Classical (Mendelian) Genetics Chapter 11 Classical (Mendelian) Genetics The study of how genes bring about characteristics, or traits, in living things and how those characteristics are inherited. Genetics Geneticist A scientist who

More information

Bb Tt Ll Aa Hh Ee. 6. Use the code to DRAW (build) A PICTURE OF WHAT THIS SNOWBABY WILL LOOK LIKE.

Bb Tt Ll Aa Hh Ee. 6. Use the code to DRAW (build) A PICTURE OF WHAT THIS SNOWBABY WILL LOOK LIKE. Snowman (Snowpeople) GENETICS NAME The GENOTYPE for your parent Snowperson is: Bb Tt Ll Aa Hh Ee 1. This parent is for all of its alleles. homozygous heterozygous 2. What is its PHENOTYPE? 3. Draw (build)

More information

THE STEPS WHEN INTERPRETING A PEDIGREE CHART

THE STEPS WHEN INTERPRETING A PEDIGREE CHART THE STEPS WHEN INTERPRETING A PEDIGREE CHART Determine if the pedigree chart shows an autosomal or X- linked disease. If most of the males in the pedigree are affected, then the disorder is X-linked If

More information

Question #1. How many different kinds of gametes could the following individuals produce? 1. aabb 2. CCDdee 3. AABbCcDD 4. MmNnOoPpQq 5.

Question #1. How many different kinds of gametes could the following individuals produce? 1. aabb 2. CCDdee 3. AABbCcDD 4. MmNnOoPpQq 5. GENETIC PROBLEMS Question #1 How many different kinds of gametes could the following individuals produce? 1. aabb 2. CCDdee 3. AABbCcDD 4. MmNnOoPpQq 5. UUVVWWXXYYZz Question #1 Remember the formula 2

More information

The Mendelian Genetics of Corn

The Mendelian Genetics of Corn The Mendelian Genetics of Corn (Adapted from Mendelian Genetics for Corn by Carolina Biological Supply Company) Objectives: In this laboratory investigation, you will: a. Use corn to study genetic crosses.

More information

INCOMPLETE DOMINANCE

INCOMPLETE DOMINANCE DOMINANCE INCOMPLETE DOMINANCE Pattern of gene expression in which the phenotype of a heterozygous individual is intermediate between those of the parents. Cases in which one allele is not completely dominant

More information

NAME PER DATE. We'll analyze inheritance for the case where each parent has one A allele and one a allele (i.e. both parents are Aa).

NAME PER DATE. We'll analyze inheritance for the case where each parent has one A allele and one a allele (i.e. both parents are Aa). 1 NAME PER DATE GENETICS REVIEW We all know that children tend to resemble their parents in appearance. Parents and children generally have similar eye color, hair texture, height and other characteristics

More information

Notes: Types of Inheritance

Notes: Types of Inheritance Notes: Types of Inheritance Think about it You have a purple flower, you know purple is the dominate allele, but you do not know the genotype of the plant. How could you figure out it s genotype? Assume

More information

Genetics Problems Part I: Monohybrid/One-Factor Crosses

Genetics Problems Part I: Monohybrid/One-Factor Crosses Genetics Problems Part I: Monohybrid/One-Factor Crosses 1. In humans, curly hair is dominant over straight hair. A woman who is heterozygous for hair curl marries a man with straight hair and they have

More information

BASIC GENETICS VOCABULARY

BASIC GENETICS VOCABULARY Name: Date: Period: Genetics Problem Sets Introduction: How do organisms come to look and act the way they do? How are characteristics passed from generation to generation? Genetics, the study of inheritance,

More information

What is Genetics? Genetics is the scientific study of heredity

What is Genetics? Genetics is the scientific study of heredity What is Genetics? Genetics is the scientific study of heredity What is a Trait? A trait is a specific characteristic that varies from one individual to another. Examples: Brown hair, blue eyes, tall, curly

More information

MENDELIAN GENETICS. genes and their interactions with the environment. Human height and intelligence are among these complex polygenic characters.

MENDELIAN GENETICS. genes and their interactions with the environment. Human height and intelligence are among these complex polygenic characters. Name: Dr. Gonzalez BSC2005 In-Class Worksheet MENDELIAN GENETICS Introduction In sexually reproducing animals, genetic information is passed from the parents to offspring by means of haploid gametes (egg

More information

Mendelian Genetics. I. Background

Mendelian Genetics. I. Background Mendelian Genetics Objectives 1. To understand the Principles of Segregation and Independent Assortment. 2. To understand how Mendel s principles can explain transmission of characters from one generation

More information

SHOULD THIS DOG BE CALLED SPOT?

SHOULD THIS DOG BE CALLED SPOT? SHOULD THIS DOG BE CALLED SPOT? Imagine this microscopic drama. A sperm cell from a male dog fuses with an egg cell from a female dog. Each dog s gamete carries 39 chromosomes. The zygote that results

More information

Chapter 14: Mendel and the Gene Idea

Chapter 14: Mendel and the Gene Idea Name Period Chapter 14: Mendel and the Gene Idea If you have completed a first-year high school biology course, some of this chapter will serve as a review for the basic concepts of Mendelian genetics.

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

MODULE 11: MENDELIAN GENETICS 1

MODULE 11: MENDELIAN GENETICS 1 PEER-LED TEAM LEARNING INTRODUCTORY BIOLOGY MODULE 11: MENDELIAN GENETICS 1 JOSEPH G. GRISWOLD, PH.D. (City College of New York, CUNY) I. Introduction In sexually reproducing animals, genetic information

More information

Appendix A. Examples of homework, quiz and exam questions that address Learning Goal 1. A. Examples of homework questions (Learning Goal 1)

Appendix A. Examples of homework, quiz and exam questions that address Learning Goal 1. A. Examples of homework questions (Learning Goal 1) Appendix A. Examples of homework, quiz and exam questions that address Learning Goal 1. A. Examples of homework questions (Learning Goal 1) 1. Shared questions on homeworks for both majors and non majors.

More information

Name: Period: Date: PAP Meiosis, Genetics & Heredity Test Review KEY

Name: Period: Date: PAP Meiosis, Genetics & Heredity Test Review KEY Name: Period: Date: PAP Meiosis, Genetics & Heredity Test Review KEY 1. How are an organism s complex traits determined? DNA contains codes for proteins which are necessary for growth an functioning in

More information

Problems 1-6: In tomato fruit, red flesh color is dominant over yellow flesh color, Use R for the Red allele and r for the yellow allele.

Problems 1-6: In tomato fruit, red flesh color is dominant over yellow flesh color, Use R for the Red allele and r for the yellow allele. Genetics Problems Name ANSWER KEY Problems 1-6: In tomato fruit, red flesh color is dominant over yellow flesh color, Use R for the Red allele and r for the yellow allele. 1. What would be the genotype

More information

6/2/2015. (Sperm could also be XY)

6/2/2015. (Sperm could also be XY) Chapter 6 Genetics and Inheritance Sometimes there is not one clear dominant allele In a heterozygous individual, both alleles are expressed Phenotype is a blend of both traits Lecture 2: Genetics and

More information

Genetics. PART I: Mitosis & Meiosis prerequisites for inheritance. A. Mitosis. Review: A closer look inside of the nucleus: DNA: chromatin:

Genetics. PART I: Mitosis & Meiosis prerequisites for inheritance. A. Mitosis. Review: A closer look inside of the nucleus: DNA: chromatin: Genetics PART I: Mitosis & Meiosis prerequisites for inheritance A. Mitosis Review: A closer look inside of the nucleus: DNA: chromatin: chromosome: parts: chromatid: centromere: telomere: 1 Mitosis &

More information

MANDELIAN GENETICS. Crosses that deviate from Mandelian inherintance

MANDELIAN GENETICS. Crosses that deviate from Mandelian inherintance MANDELIAN GENETICS Crosses that deviate from Mandelian inherintance Explain codominant alleles. TO THE STUDENTS Calculate the genotypic and phenotypic ratio (1:2:1). Explain incomplete dominant alleles.

More information

BABY LAB. Let E = the dominant form of the gene / unattached earlobes Let e = the recessive form of the gene / attached earlobes E E

BABY LAB. Let E = the dominant form of the gene / unattached earlobes Let e = the recessive form of the gene / attached earlobes E E Baby Face 1 NAME BABY LAB BACKGROUND INFORMATION: Heredity is the passing of traits from parents to children. Hair color, eye color, eye shape, blood type and some diseases are all examples of traits that

More information

2. A chromosome with a centromere at the very end is called telocentric.

2. A chromosome with a centromere at the very end is called telocentric. Problem Set 1A Due August 31 1. A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42). As in humans, sex chromosomes determine sex: XX in females and XY in males. i. What is the total

More information

Mendel s Laws. Patterns of Gene Inheritance. Gregor Mendel. What We Know Now. Gene locus. The Inheritance of a Single Trait.

Mendel s Laws. Patterns of Gene Inheritance. Gregor Mendel. What We Know Now. Gene locus. The Inheritance of a Single Trait. Mendel s Laws Patterns of Gene Inheritance Gregor Mendel - Austrian monk Developed laws of heredity Worked with pea plants Investigated genetics at organism level Gregor Mendel What Mendel Said: 1. Characteristics

More information

3. Mating two organisms produces a 3:1 ratio of the phenotype in progeny. The parental genotypes are

3. Mating two organisms produces a 3:1 ratio of the phenotype in progeny. The parental genotypes are 1. In dihybrid crosses, the ratio 9:3:3:1 indicates A. codominance. B. independent assortment. C. intermediate dominance. D. three alleles for each trait. 2. Mating of two organisms produces a 1:1 ratio

More information

11.1 The Work of Gregor Mendel

11.1 The Work of Gregor Mendel 11.1 The Work of Gregor Mendel Lesson Objectives Describe Mendel s studies and conclusions about inheritance. Describe what happens during segregation. Lesson Summary The Experiments of Gregor Mendel The

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

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

11.1 Traits. Studying traits CHAPTER 11. Breeds and traits. Genetics is the study of heredity

11.1 Traits. Studying traits CHAPTER 11. Breeds and traits. Genetics is the study of heredity 11.1 Traits Tyler has free earlobes like his father. His mother has attached earlobes. Why does Tyler have earlobes like his father? In this section you will learn about traits and how they are passed

More information

Extending Mendel s Law. Incomplete dominance / Codominance / Multiple alleles

Extending Mendel s Law. Incomplete dominance / Codominance / Multiple alleles Extending Mendel s Law Incomplete dominance / Codominance / Multiple alleles Incomplete Dominance Pattern of gene expression in which the phenotype of a heterozygous individual is intermediate between

More information

6.1: Beyond Mendel s Observations of Inheritance pg. 242

6.1: Beyond Mendel s Observations of Inheritance pg. 242 6.1: Beyond Mendel s Observations of Inheritance pg. 242 Incomplete Dominance Incomplete dominance: is condition in which neither allele for a gene completely conceals the presence of the other; it results

More information

Name Period. 3. How many rounds of DNA replication and cell division occur during meiosis?

Name Period. 3. How many rounds of DNA replication and cell division occur during meiosis? Name Period GENERAL BIOLOGY Second Semester Study Guide Chapters 3, 4, 5, 6, 11, 14, 16, 17, 18 and 19. SEXUAL REPRODUCTION AND MEIOSIS 1. What is the purpose of meiosis? 2. Distinguish between diploid

More information

Dihybrid Cross. Dihybrid Cross. Incomplete Dominance

Dihybrid Cross. Dihybrid Cross. Incomplete Dominance Dihybrid Cross Dihybrid Cross Cross involving two traits Mendel Observed that the genes for the different characters he studied were passed on independently of one another Genes for these characters resided

More information

BIOL101H Sp 12 Dr. Young. Genetics Problems Answer Key. Please do the following problems on separate sheets of paper and attach them to this sheet.

BIOL101H Sp 12 Dr. Young. Genetics Problems Answer Key. Please do the following problems on separate sheets of paper and attach them to this sheet. BIOL101H Sp 12 Dr. Young Name Genetics Problems Answer Key Please do the following problems on separate sheets of paper and attach them to this sheet. 1. If a child has type O (ii) blood and the father

More information

CCR Biology - Chapter 7 Practice Test - Summer 2012

CCR Biology - Chapter 7 Practice Test - Summer 2012 Name: Class: Date: CCR Biology - Chapter 7 Practice Test - Summer 2012 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A person who has a disorder caused

More information

MODULE 12: MENDELIAN GENETICS 2

MODULE 12: MENDELIAN GENETICS 2 PEER-LED TEAM LEARNING INTRODUCTORY BIOLOGY MODULE 12: MENDELIAN GENETICS 2 JOSEPH G. GRISWOLD, PH.D.* AND DAVID L. WILSON, PH.D.+ (*City College of New York, CUNY; +Univ. of Miami, FL) I. Introduction

More information

Exam #2 BSC Fall. NAME Key answers in bold

Exam #2 BSC Fall. NAME Key answers in bold Exam #2 BSC 2011 2004 Fall NAME Key answers in bold _ FORM B Before you begin, please write your name and social security number on the computerized score sheet. Mark in the corresponding bubbles under

More information