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Variations on a Theme by Mendel A plant geneticist is examining the mode of inheritance of flower color in two closely related species of exotic plants. One species may have two pure-breeding lines—one produces a distinct red flower, and the other produces flowers with no color at all, or very pale yellow flowers—however, she cannot be sure. A cross of these varieties produces all pink-flowered progeny. The second species exhibits similar pure-breeding varieties; that is, one variety produces red flowers, and the other produces an albino or very pale yellow flower. A cross of these two varieties, however, produces orange-flowered progeny exclusively. Analyze the mode of inheritance of flower color in these two plant species.

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Human Heredity: Principles and Iss...

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

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Chapter
Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 3, Problem 31QP
Textbook Problem
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Variations on a Theme by Mendel

A plant geneticist is examining the mode of inheritance of flower color in two closely related species of exotic plants. One species may have two pure-breeding lines—one produces a distinct red flower, and the other produces flowers with no color at all, or very pale yellow flowers—however, she cannot be sure. A cross of these varieties produces all pink-flowered progeny. The second species exhibits similar pure-breeding varieties; that is, one variety produces red flowers, and the other produces an albino or very pale yellow flower. A cross of these two varieties, however, produces orange-flowered progeny exclusively. Analyze the mode of inheritance of flower color in these two plant species.

Summary Introduction

To predict: The mode of inheritance of flower color in the given plant species.

Introduction: Gregor Mendel was an Austrian monk, who worked on the pea plant to observe the pattern of inheritance of certain characters from the parent plant to the offsprings. He termed genes as factors that are passed from one generation to another. He proposed three laws, which came to be known as Mendel’s law of genetics.

Explanation of Solution

The cross made between the true-breeding red flower (RR) and true-breeding no color/very pale yellow flower (rr) will produce exclusively pink flowers with genotype “Rr”. When this plant is self-crossed, the progeny produced is as follows:

GametesRR
r

Rr

(pink flower)

Rr

(pink flower)

r

Rr

(pink flower)

Rr

(pink flower)

The progeny flowers are exclusively pink as the red flower color is not completely dominant over the white flower color in the heterozygous condition. The mixture of two traits or colors is seen in the heterozygous flowers which are pink. This is an exception to the Mendelian law of dominance. This phenomenon is called “Incomplete dominance”.

When the cross between the red flowers and the pale or light yellow colored flowers is made the progeny flowers are orange due to codominance...

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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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