Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
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.

Expert Solution & Answer
Check Mark
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.

Campbell Biology (10th Edition), Chapter 14, Problem 14.1CR

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

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
02:40
Students have asked these similar questions
Mendel crossed peas having round seeds and yellow cotyledons with peas having wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram this cross through the F2 generation, using both the Punnett square and forked-line methods.
Mendel crossed peas having round seeds and yellow cotyledons (seed leaves) with peas having wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram this cross through the F2 generation, using both the Punnett square and forked-line, or branch diagram, methods.
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.

Chapter 14 Solutions

Campbell Biology (10th Edition)

Additional Science Textbook Solutions

Find more solutions based on key concepts
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY