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Red-flowering snapdragons are homozygous for allele R I . White-flowing snapdragons are homozygous for a different allele ( R 2 ). Heterozygous plants ( R 1 R 2 ) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. R 1 R 1 × R 1 R 2 b. R 1 R 1 × R 2 R 2 c. R 1 R 2 × R 1 R 2 d. R 1 R 2 × R 2 R 2

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 9GP
Textbook Problem
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Red-flowering snapdragons are homozygous for allele RI. White-flowing snapdragons are homozygous for a different allele (R2). Heterozygous plants (R1 R2) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype?

  1. a. R1R1 × R1R2
  2. b. R1R1 × R2R2
  3. c. R1R2 × R1R2
  4. d. R1R2 × R2R2

a.

Summary Introduction

To explain: The phenotype of the first generation offspring and expected proportion of each phenotype for R1R1 × R1R2.

Concept introduction: Incomplete dominance is a type of Non-Mendelian inheritance where the heterozygous phenotype is the intermediate of the homozygous dominant and homozygous recessive phenotypes.

Explanation of Solution

A monohybrid cross is constructed with Punnett square for the parents having the genotype R1R1 and R1R2...

b.

Summary Introduction

To explain: The phenotype of the first generation offspring and expected proportion of each phenotype for R1R1 × R2R2.

Concept introduction: Incomplete dominance is a type of Non-Mendelian inheritance where the heterozygous phenotype is the intermediate of the homozygous dominant and homozygous recessive phenotypes.

c.

Summary Introduction

To explain: The phenotype of the first generation offspring and expected proportion of each phenotype for R1R1 × R2R2.

Concept introduction: Incomplete dominance is a type of Non-Mendelian inheritance where the heterozygous phenotype is the intermediate of the homozygous dominant and homozygous recessive phenotypes.

d.

Summary Introduction

To explain: The phenotype of the first generation offspring and expected proportion of each phenotype for R1R2× R2R2.

Concept introduction: Incomplete dominance is a type of Non-Mendelian inheritance where the heterozygous phenotype is the intermediate of the homozygous dominant and homozygous recessive phenotypes.

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