Answers to Mendelian genetics questions BI164 Spring, 2007

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Answers to Mendelian genetics questions BI164 Spring, 2007"

Transcription

1 Answers to Mendelian genetics questions BI164 Spring, 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 of the colorblind allele of her son. The daughter must inherit the dominant allele from her father. She has a 50% chance of inheriting the recessive allele from her mother. Therefore the probability that the daughter is a carrier is 1/2. 2. The father (I-2) does not show the disease and must therefore be DY. The mother (I-1) must be a carrier of the disease so she is Dd. The affected son (II-2) must be dy, having inherited the d allele from his mother. The other son (II-1) does not show the disease and must be DY. The daughter (II-3) had a 50% chance of inheriting the d allele from her mother. Her husband(ii-4), from outside the family, does not have the disease and is therefore DY. Their son (III-1) has the disease and must be dy. He must have inherited the d allele from his mother so we know that II-3 must be Dd. 3. The results from part (a) indicate the mutation for Bar eyes is an X-linked trait. Furthermore, these results suggest that the Bar allele is dominant. The daughters of a Bar male must receive the Bar allele from their father. Since their mothers do not have the Bar allele, the daughters are heterozygotes and the Bar allele is expressed. Sons must receive a Y chromosome from their father and a wildtype allele from their mother. The hemizygous males therefore show the wildtype eye. We can test our hypothesis with a test cross, yielding the results in part b. The Bar females in the F 1 are heterozygotes. The males are hemizygous for the wild type allele. Each offspring must receive the wildtype allele from the father. Half of the offspring will receive the Bar allele from the mother and half will receive the wildtype allele. For daughters, half will be Bar/wildtype and half will be homozygous for wildtype, yielding a 1:1 ratio of Bar to wildtype. For sons, the males must receive the Y chromosome from their father. Half of the sons will receive a Bar allele from the mother and half will receive a wildtype allele, again resulting in a 1:1 ratio of Bar to wildtype. 4. These results suggest that incomplete dominance is the type of inheritance in these cattle. The roan cattle are intermediate in coat color. When roan is crossed with roan, we expect one red (homozygote) to two roan (heterozygote) to one white (homozygote).

2 5. The allele for taillessness is dominant. A cross of tailless x tailless mice produces more tailless mice than wildtype mice. The ratio of 2:1 brings to mind lethal genes. We know from the above information that tailless mice do not breed true. The expected ratio of three tailless mice to one wildtype mouse is not observed. The most likely explanation is that a homozygote for the tailless allele is a lethal combination. The surviving tailless mice do not have that lethal combination because they are heterozygous. The heterozygotes outnumber the wildtype mice 2:1, as expected. 6. The chance that a child will be a girl or a boy is independent of other offspring. The probability of the next child being a boy is 1/2 in both cases. 7. Calculate the probability of obtaining: a. An Aa BB Cc zygote from a cross of Aa Bb Cc x Aa Bb Cc Chance of Aa 2/4 Chance of BB 1/4 Chance of Cc - 2/4 Since these genes assort independently, the overall probability is the product of the three individual probabilities = 1/2 x 1/4 x 1/2 = 1/16 b. An Aa BB cc zygote from a cross of aa BB Cc x AA bb CC Chance of Aa 1/1 Chance of BB 0/1 Chance of cc - 0/1 Therefore, for two reasons, there is no way to realize the Aa BB cc genotype in this cross. c. An A B C phenotype from a cross of Aa Bb CC x Aa Bb cc Chances of A_ - 3/4 Chances of B_ - 3/4 Chances of C_ - 1/1 Overall probability - 3/4 x 3/4 x 1 = 9/16 d. An a b c phenotype from a cross of AA BB CC x AA BB CC There is no source of recessive alleles for any of the loci and therefore the phenotype cannot be produced.

3 8. The results suggest a simple two-allele, single locus system. The results conform to the expected 3:1 ratio of phenotypes for a monohybrid cross. The only true-breeding purple flowers will be the homozygotes (PP). They make up a third of the purple flowers. All of the white-flowered progeny will be true breeding. 9. Dihybrid cross problems. a. PP ss x pp SS 100% purple 100% spiny 100% purple flowers, spiny pods b. Pp SS x pp ss 50% purple 100% spiny 1/2 purple flowers, spiny pods 50% white 100% spiny 1/2 white flowers, spiny pods c. Pp Ss x Pp SS 75% purple 100% spiny 3/4 purple flowers, spiny pods 25% white 100% spiny 1/4 white flowers, spiny pods d. Pp Ss x Pp ss 75% purple 50% spiny 3/8 purple flowers, spiny pods 50% smooth 3/8 purple flowers, smooth pods 25% white 50% spine 1/8 white flowers, spiny pods 50% smooth 1/8 white flowers, smooth pods

4 e. Pp Ss x Pp Ss 75% purple 75% spiny 9/16 purple flowers, spiny pods 25% smooth 3/16 purple flowers, smooth pods 25% white 75% spiny 3/16 white flowers, spiny pods 25% smooth 1/16 white flowers, smooth pods f. Pp Ss x pp ss 50% purple 50%% spiny 1/4 purple flowers, spiny pods 50% smooth 1/4 purple flowers, smooth pods 50% white 50%% spiny 1/4 white flowers, spiny pods 50% smooth 1/4 white flowers, smooth pods 10. Autosomal dominant If we assume I-2 is heterozygous for the trait, we can find no part of the pedigree that cannot be explained by inheritance as an autosomal dominant. Autosomal recessive We can reject this mechanism because II-1 and II-2 produced a son without the trait. X-linked dominant If this mechanism is correct, the grandfather I-1 must be hemizygous for the recessive allele and the grandmother I-2 must be heterozygous because their children include both a male and female without the trait. II-2 must have married a woman heterozygous for the trait (II-1) because they produce sons with and without the trait. II-6 is hemizygous for the trait. His wife (II-7) must be homozygous recessive. All of their daughters must inherit a dominant allele from the father and the sons will lack the trait since they must inherit their only allele from their mother. X-linked recessive We can reject this mechanism because female I-1 or II-1 could only have sons with the trait. II-5, III-1 and III-4 lack the trait so we know the trait cannot be an X-linked recessive. In summary, we have two possible mechanisms of inheritance for this trait. We cannot distinguish between them with the present information.

5 However, the fact that every daughter of a man with the trait also has the trait indicates that X-linked dominance is the more likely mechanism. With autosomal dominance, one would expect half of the daughters of fathers II-2 and II-6 to have the trait and half to lack it. 11. ABO blood type questions a. An O child from the marriage of two A individuals This result is possible if both parents are heterozygotes (I A i) b. An O child from the marriage of an A to a B Also possible if both parents are heterozygous (I B i and I A i) c. An AB child from the marriage of an A to an O Not possible. The parent with O blood cannot contribute the B allele needed. d. An O child from the marriage of an AB to an A Not possible. The O child must be ii and the AB parent has no i allele to contribute. e. An A child from the marriage of an AB to a B Possible if the B parent is heterozygous (I B i). 12. For each of the first cousins, one parent had a sibling with the disease. We know that their grandparents both had to be heterozygous for the PKU gene since neither had the disease but one of their children did have the disease. Therefore the two siblings (II-2 and II-4) have two chances in three they have the disease (since they are not homozygous recessive, there are three genotypes homozygous dominant, heterozygous with PKU gene inherited from the mother, heterozygous with the PKU gene inherited from the father). The chance that each first cousin (III-1 and III-2) inherited the PKU gene from her/his parent is 1:2 by Mendel s Law of Segregation. So, the probability that each first cousin is a carrier for the PKU allele is 2/3 x 1/2 = 1/3 When the two cousins marry, four genotypes are possible but only one will cause the disease (homozygous recessive). So, the overall probability is: Probability III-1 has the PKU gene x probability that III-2 has the PKU gene x probability of producing a homozygous recessive = 1/3 x 1/3 x 1/4 = 1/36

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

Mendelian Genetics and Inheritance Problems

Mendelian Genetics and Inheritance Problems 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

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

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 : 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

MCB142/IB163 Mendelian and Population Genetics 9/19/02

MCB142/IB163 Mendelian and Population Genetics 9/19/02 MCB142/IB163 Mendelian and Population Genetics 9/19/02 Practice questions lectures 5-12 (Hardy Weinberg, chi-square test, Mendel s second law, gene interactions, linkage maps, mapping human diseases, non-random

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

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

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

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 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

Modification to Mendel s Classic Ratios

Modification to Mendel s Classic Ratios Modification to Mendel s Classic Ratios by CHED on October 07, 2016 lesson duration of 30 minutes under General Biology 2 generated on October 07, 2016 at 04:07 am Tags: Modification to Mendel s Classic

More information

Easter School Life Sciences Grade 12. Genetics: Inheritance and Terminology 26 March 2013

Easter School Life Sciences Grade 12. Genetics: Inheritance and Terminology 26 March 2013 Genetics: Inheritance and Terminology 26 March 2013 Key Concepts Genetics is a science and specific terms are used. Make sure that you know and understand the following terms before you continue. Terminology

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

EXTENSIONS OF MENDELIAN INHERITANCE.

EXTENSIONS OF MENDELIAN INHERITANCE. CHAPTER 4: EXTENSIONS OF MENDELIAN INHERITANCE. Many crosses do not yield simple Mendelian ratios. Instead, the ratios are modified. These modifications reflect complexities in gene expression not complexities

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

Probability and the Idea of Chance

Probability and the Idea of Chance Probability and the Idea of Chance Instructions Activity 1. The Idea of Chance Consider a simple demonstration of the operation of chance (i.e., probability) in the tossing of coins. It is usually impossible

More information

Today s Objectives. Probability rules apply to inheritance at more than one locus

Today s Objectives. Probability rules apply to inheritance at more than one locus Figure 14.8 Segregation of alleles and fertilization as chance events Today s Objectives Use rules of probability to solve genetics problems Define dominance, incomplete dominance, and co-dominance Extend

More information

Dr. Young. Genetics Problems Set #1 Answer Key

Dr. Young. Genetics Problems Set #1 Answer Key BIOL276 Dr. Young Name Due Genetics Problems Set #1 Answer Key For problems in genetics, if no particular order is specified, you can assume that a specific order is not required. 1. What is the probability

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. 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

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

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

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

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

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

Mendelian Genetics Problems

Mendelian Genetics Problems BIO 181 Lab Fall 2015 Name: Mendelian Genetics Problems 1) Do your own work. These problems are similar to what will occur on the second lecture exam, final exam and lab quizzes. Do not share or work with

More information

Lab 7. Mendelian Genetics

Lab 7. Mendelian Genetics Lab 7. Mendelian Genetics Prelab Assignment Before coming to lab, 1. Answer the prelab questions on pages 3 4 of the report sheet. 2. Read pages 1-2 of this lab and complete Report pages 5 6. Goals of

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

Lab. 9 Deviation of Mendel s first law Monohybrid part 2

Lab. 9 Deviation of Mendel s first law Monohybrid part 2 Main topics: Lab. 9 Deviation of Mendel s first law Monohybrid part 2 Deviation of Mutation a. ABO type b. Fur color of rabbits Deviation of Sex a. Sex limited b. Sex influence c. Sex linkage Deviation

More information

If you have problems with the security or Java settings on school computers, scroll to the end of this document for instructions.

If you have problems with the security or Java settings on school computers, scroll to the end of this document for instructions. Fly Lab Go to this site: biologylab.awlonline.com Click on FlyLab login: gonzagax (x = 1 16) password: apeseaglex click on start lab If you have problems with the security or Java settings on school computers,

More information

Mendelian inheritance and the

Mendelian inheritance and the Mendelian inheritance and the most common genetic diseases Cornelia Schubert, MD, University of Goettingen, Dept. Human Genetics EUPRIM-Net course Genetics, Immunology and Breeding Mangement German Primate

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

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

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

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 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

More Heredity Problems You ve Inherited From Your Teacher X X X X Y X X X X Y

More Heredity Problems You ve Inherited From Your Teacher X X X X Y X X X X Y In class examples Example 1: a) Show why the possibility of getting a baby girl is 50%. X X X X X Y Y X X X X Y 2 XY /4 possibiliites * 100% = 50% b) If you already have three girls, is the possibility

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

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

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

Conceptual Questions C1. Answer: Dominance occurs when one allele completely exerts its phenotypic effects over another allele. Incomplete dominance

Conceptual Questions C1. Answer: Dominance occurs when one allele completely exerts its phenotypic effects over another allele. Incomplete dominance Conceptual Questions C1. Answer: Dominance occurs when one allele completely exerts its phenotypic effects over another allele. Incomplete dominance is a situation in which two alleles in the heterozygote

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

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

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

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

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

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

Alleles, Phenotype & Genetic interaction

Alleles, Phenotype & Genetic interaction Alleles, Phenotype & Genetic interaction Problem Set #2 (not for credit): (thanks to Steve Jackson for some of these problems) 1. For each of the terms in the left column, choose the best matching phrase

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

Complex Inheritance. Mendel observed monogenic traits and no linked genes It s not usually that simple.

Complex Inheritance. Mendel observed monogenic traits and no linked genes It s not usually that simple. Complex Inheritance Mendel observed monogenic traits and no linked genes It s not usually that simple. Other Types of Inheritance Incomplete Dominance The phenotype of the heterozygote is intermediate

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

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

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

7.014 Problem Set 7 Solutions

7.014 Problem Set 7 Solutions 7.014 Problem Set 7 Solutions Question 1 Meiosis is the process by which gametes or sex cells are created. Recall that chromosome content of the cell undergoing meiosis changes from 2n to 4n to 1n. a)

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

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 2250 Principles of Genetics. Weekly Online Quizzes. WebCT Quizzes. Mendelian Genetics. Basic Concepts of Genetics

Biology 2250 Principles of Genetics. Weekly Online Quizzes. WebCT Quizzes. Mendelian Genetics. Basic Concepts of Genetics Biology 2250 Principles of Genetics Announcements Test I marks are posted outside SN-3021 and in the lab. Exams will be returned Tuesday Spring Biology Courses at Harlow: http://www.mun.ca/harlow/ Weekly

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

Non-Mendelian Genetics. Chapter Five

Non-Mendelian Genetics. Chapter Five Non-Mendelian Genetics Chapter Five Mendel s Laws 1. Principle of Segregation Two alleles segregate randomly during formation of gametes 2. Independent Assortment Two genes will assort independently and

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

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

TEST NAME: Genetics unit test TEST ID: GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment

TEST NAME: Genetics unit test TEST ID: GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment TEST NAME: Genetics unit test TEST ID: 437885 GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment Genetics unit test Page 1 of 12 Student: Class: Date: 1. There are four blood

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

Biology 201 (Genetics) Exam #1 21 September 2004

Biology 201 (Genetics) Exam #1 21 September 2004 Name KEY Biology 201 (Genetics) Exam #1 21 September 2004 Read the question carefully before answering. Think before you write. Be concise. You will have up to 85 minutes hour to take this exam. After

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

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

Collated questions Demonstrate understanding of biological ideas relating to genetic variation DNA STRUCTURE

Collated questions Demonstrate understanding of biological ideas relating to genetic variation DNA STRUCTURE Collated questions Demonstrate understanding of biological ideas relating to genetic variation DNA STRUCTURE THE ROLE OF DNA IN INHERITANCE (2013:2) (a) Use the diagram above to help you explain the relationship

More information