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More Crosses with Pea Plants: The Principle of Independent Assortment Two traits are examined simultaneously in a cross of two pure-breeding pea-plant varieties. Pod shape can be either swollen or pinched. Pea color can be either green or yellow. A plant with the traits swollen and green is crossed with a plant with the traits pinched and yellow, and a resulting F1 plant is self-crossed. A total of 640 F2 progeny are phenotypically categorized as follows: 360 swollen yellow 120 swollen green 120 pinched yellow 40 pinched green a. What is the phenotypic ratio observed for pod shape? Pea color? b. What is the phenotypic ratio observed for both traits considered together? c. What is the dominance relationship for pod shape? Pea color? d. Deduce the genotypes of the P1 and F1 generations.

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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 15QP
Textbook Problem
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More Crosses with Pea Plants: The Principle of Independent Assortment

Two traits are examined simultaneously in a cross of two pure-breeding pea-plant varieties. Pod shape can be either swollen or pinched. Pea color can be either green or yellow. A plant with the traits swollen and green is crossed with a plant with the traits pinched and yellow, and a resulting F1 plant is self-crossed. A total of 640 F2 progeny are phenotypically categorized as follows:

360 swollen yellow

120 swollen green

120 pinched yellow

40 pinched green

  1. a. What is the phenotypic ratio observed for pod shape? Pea color?
  2. b. What is the phenotypic ratio observed for both traits considered together?
  3. c. What is the dominance relationship for pod shape? Pea color?
  4. d. Deduce the genotypes of the P1 and F1 generations.

a.

Summary Introduction

To determine: The phenotypic ratio for the pod shape and the pod color.

Introduction: 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.

Explanation of Solution

The cross of the plants with the pods with phenotype swollen green (RRyy) and yellow pinched (rrYY) produce the following F1 generation:

GametesRyRy
rY

RrYy

(yellow swollen)

RrYy

(yellow swollen)

rY

RrYy

(yellow swollen)

RrYy

(yellow swollen)

The first generation will have all the plants with pods yellow and swollen. However, when this F1 hybrid is self-crossed, then the second generation plants are produced as follows:

GametesRYRyrYry
RY

RRYY

(swollen yellow)

RRYy

(swollen yellow)

RrYY

...

b.

Summary Introduction

To determine: The phenotypic ratio for both the traits when considered together.

Introduction: Out of two alleles that make up a gene, 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 dominance relationship for pod shape and pod color.

Introduction: The Mendelian experiment was based on the seven important characters expressed by the pea plant. The mode of inheritance performed and studied by Gregor Mendel on Pisum sativum lead to the development of the Mendelian laws of genetics.

d.

Summary Introduction

To determine: The genotypes for P1 and F1 generations.

Introduction: 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.

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - Crossing Pea Plants: Mendels Study of Single...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - More Crosses with Pea Plants: The Principle of...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Variations on a Theme by Mendel A characteristic...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Variations on a Theme by Mendel Pea plants usually...Ch. 3 - Variations on a Theme by Mendel A plant geneticist...Ch. 3 - Variations on a Theme by Mendel What are the...Ch. 3 - Meiosis Explains Mendels Results: Genes Are on...Ch. 3 - Variations on a Theme by Mendel What is the chance...Ch. 3 - Variations on a Theme by Mendel A hypothetical...Ch. 3 - Variations on a Theme by Mendel In homozygotes,...

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