EBK CAMPBELL BIOLOGY
EBK CAMPBELL BIOLOGY
11th Edition
ISBN: 9780134505589
Author: Urry
Publisher: PEARSON CO
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Textbook Question
Chapter 14, Problem 14.1CR

When Mendel did crosses of true-breeding purple- and white-flowered pea plants, the white-flowered trait disappeared from the F1. generation but reappeared in the F2 generation. Use genetic terms to explain why that happened.

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Summary Introduction

To explain: Why the white color trait disappeared in the F1 generation and was again observed in the F2 generation in Mendel’s cross between purple- and white- flowered pea plants.

Introduction: Genes have alternate forms known as alleles, which are transmitted to offspring. If the two alleles are different, then there is a hybrid in the F1 generation. The dominant allele out of the two expresses itself and determines the phenotype. In F1 individuals, two different alleles segregate into gametes. During self-pollination, the gametes unite randomly, thereby giving a chance to recessive alleles to be expressed in a homozygous state at the F2 generation.

Explanation of Solution

The cross between the individuals that are true breeding homozygous for one allele gives different traits in F1 progeny. This is called as monohybrid cross. Several traits of pea plants were studied in which Mendel used the purple- and white-colored flower traits to perform monohybrid experiment. When Mendel crossed these plants, the F1 hybrids or first true breeding generation received was both dominant and recessive alleles equally but showed a purple pigment. This is because the purple-colored trait was dominant over white. That is, white-colored trait is and was not expressed recessive in the F1 generation. However, the white trait was expressed in F2 generation of the experiment. This was because it is only possible for a white allele to exist in a homozygous state, which causes the white trait to be expressed in F2 generation.

Pictorial representation: Fig.1 shows Mendel’s cross between purple- and white-flowered pea plants.

EBK CAMPBELL BIOLOGY, Chapter 14, Problem 14.1CR

Fig.1: Mendel’s cross between purple- and white-flowered pea plants

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Students have asked these similar questions
Mendel performs a cross using a true-breeding pea plant with round, yellow seeds and a true-breeding pea plant with green, wrinkled seeds. What is the probability that offspring will have green, round seeds? Calculate the probability for the F1 and F2 generations.
Over the years, Mendel experimented with more than 30,000 pea plants. Why did Mendel collect data on so many plants? Why didn’t he study just one cross? Hint: Read “What Are the Odds?” on page 124 before answering.
When Mendel crossed in his P generation a yellow-seeded and green-seeded pea plants, all the offspring were yellow seeded. When he took these F1 yellow-seeded plants and crossed them with the original yellow-seeded plant from the P generation, what genotypic ratio was expected? Group of answer choices 1:2:1 3:1 1:1:1:1 1:1

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EBK CAMPBELL BIOLOGY

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