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Meiosis Explains Mendel’s Results: Genes Are on Chromosomes In peas, straight stems ( S ) are dominant to gnarled ( s ), and round peas ( R ) are dominant to wrinkled ( r ). The following cross (a test cross) is performed: SsRr × ssrr . Determine the expected phenotypes of the progeny and what fraction of the progeny should exhibit each phenotype.

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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 29QP
Textbook Problem
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Meiosis Explains Mendel’s Results: Genes Are on Chromosomes

In peas, straight stems (S) are dominant to gnarled (s), and round peas (R) are dominant to wrinkled (r). The following cross (a test cross) is performed: SsRr × ssrr. Determine the expected phenotypes of the progeny and what fraction of the progeny should exhibit each phenotype.

Summary Introduction

To predict: The expected phenotypes of the progeny and their fraction when the cross is made between “SsRr” and “ssrr”.

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

The dominant trait for the stem shape is straight stem (SS) whereas the recessive trait is gnarled stem (ss). The dominant trait for seed shape is round (RR), and the recessive trait is wrinkled (rr). Therefore, the progeny produced when SsRr is crossed with ssrr will be as follows:

GametesSRsRSrsr
sr

SsRr

(straight stems and round peas)

ssRr

(gnarled stems and round peas)

Ssrr

(straight st...

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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