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Crossing Pea Plants: Mendel’s Study of Single Traits Stem length in pea plants is controlled by a single gene. Consider the cross of a true-breeding long-stemmed variety to a true-breeding short-stemmed variety in which long stems are completely dominant. a. If 120 F1 plants are examined, how many plants are expected to be long stemmed? Short stemmed? b. Assign genotypes to both P1 varieties and to all phenotypes listed in (a). c. A long-stemmed F1 plant is self-crossed. Of 300 F2 plants, how many should be long stemmed? Short stemmed? d. For the F2 plants mentioned in (c), what is the expected genotypic ratio?

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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 11QP
Textbook Problem
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Crossing Pea Plants: Mendel’s Study of Single Traits

Stem length in pea plants is controlled by a single gene. Consider the cross of a true-breeding long-stemmed variety to a true-breeding short-stemmed variety in which long stems are completely dominant.

  1. a. If 120 F1 plants are examined, how many plants are expected to be long stemmed? Short stemmed?
  2. b. Assign genotypes to both P1 varieties and to all phenotypes listed in (a).
  3. c. A long-stemmed F1 plant is self-crossed. Of 300 F2 plants, how many should be long stemmed? Short stemmed?
  4. d. For the F2 plants mentioned in (c), what is the expected genotypic ratio?

a.

Summary Introduction

To determine: The number of long-stemmed and short-stemmed plants among 120 plants in the first filial (F1) generation.

Introduction: The ratio and proportion of the offsprings produced are depicted in terms of filial generation. The first generation produced by the parents under genetic analysis is called the first filial generation or F1 generation.

Explanation of Solution

The alleles for the true-breeding long-stemmed plant are represented as “LL” and the alleles for the true-breeding short-stemmed plant are represented as “ll.” The cross between the true-breeding long-stemmed and true-breeding short-stemmed plant will produce the offsprings in the following manner:

GametesL

b.

Summary Introduction

To determine: The genotypes of the parent varieties and the phenotypes of all the plants in the F1 generation.

Introduction: The true-breeding organisms are the ones that are homozygous for the trait. The organism can be homozygous dominant or homozygous recessive. The heterozygotes produced are of non-true-breeding nature.

Summary Introduction

To determine: The number of long-stemmed and short-stemmed plants produced when the plants from the F1 generation is self-crossed.

Introduction: Self-cross is when the plants from the first generation of the same genotype are crossed to produce the second generation known as the second filial (F2) generation.

c.

Summary Introduction

To determine: The genotypic ratios obtained after self-crossing of the first generation hybrids.

Introduction: The genotypic ratio is a mean to represent the composition of the alleles that constitute the offspring, while the phenotypic ratio represents the external characteristics expressed by the offspring.

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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