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More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness ( R ) is dominant to left-handedness ( r ). a. Parents: brown eyes, right-handed × brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed × blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed × blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handed

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 3, Problem 18QP
Textbook Problem
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More Crosses with Pea Plants: The Principle of Independent Assortment

Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r).

  1. a. Parents: brown eyes, right-handed × brown eyes, right-handed

Offspring: 3/4 brown eyes, right-handed

1/4 blue eyes, right-handed

  1. b. Parents: brown eyes, right-handed × blue eyes, right-handed

    Offspring: 6/16 blue eyes, right-handed

    2/16 blue eyes, left-handed

    6/16 brown eyes, right-handed

2/16 brown eyes, left-handed

  1. c. Parents: brown eyes, right-handed × blue eyes, left-handed

    Offspring: 1/4 brown eyes, right-handed

    1/4 brown eyes, left-handed

    1/4 blue eyes, right-handed

    1/4 blue eyes, left-handed

a.

Summary Introduction

To determine: The genotype of the parents with brown eyes and right-handed trait.

Introduction: The dominant allele masks the expression of the recessive allele. Therefore, the dominant allele is expressed in homozygous and heterozygous genotypes whereas the recessive phenotype is only expressed under homozygous condition.

Explanation of Solution

GametesBRbr
BR

BBRR

(brown eyes, right-handed)

BbRr

(brown eyes, right-handed)

br

BbRr

...

b.

Summary Introduction

To determine: The genotype of the parents having “brown eyes and are right-handed” and “blue eyes and are left-handed.”

Introduction: Among the two alleles, the dominant allele masks the expression of the recessive allele. Therefore, the dominant allele is expressed in homozygous and heterozygous genotypes while the recessive phenotype is only expressed under homozygous condition.

c.

Summary Introduction

To determine: The genotype of the parents with one parent who has blue eyes and left-handed and the other parent has brown eyes and right-handed.

Introduction: The dominant allele masks the expression of the recessive allele. Therefore, the dominant allele is expressed in homozygous and heterozygous genotypes whereas the recessive phenotype is only expressed under homozygous condition.

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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