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Crossing Pea Plants: Mendel’s Study of Single Traits An unspecified characteristic controlled by a single gene is examined in pea plants. Only two phenotypic states exist for this trait. One phenotypic state is completely dominant to the other. A heterozygous plant is self-crossed. What proportion of the progeny of plants exhibiting the dominant phenotype is homozygous?

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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 8QP
Textbook Problem
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Crossing Pea Plants: Mendel’s Study of Single Traits

An unspecified characteristic controlled by a single gene is examined in pea plants. Only two phenotypic states exist for this trait. One phenotypic state is completely dominant to the other. A heterozygous plant is self-crossed. What proportion of the progeny of plants exhibiting the dominant phenotype is homozygous?

Summary Introduction

To predict: The proportion of the progeny exhibiting the dominant phenotype is homozygous when heterozygous offspring is self-crossed.

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 made between homozygous dominant trait (TT) and homozygous recessive trait (tt) produces a heterozygous dominant plant (Tt). This heterozygous offspring will produce two types of gametes, unlike homozygous parents that produce only one type of gametes. The gametes produced will be “t” and “T”. The self-crossing of the heterozygous dominant plant produces following plant offsprings:

Gametes

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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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