Biology: The Unity and Diversity o...

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



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 8SQ
Textbook Problem

Assuming complete dominance, a cross between dihybrid F1 pea plants produces F2 phenotype ratios of ________.

  1. a. 1:2:1
  2. b. 3:1
  3. c. 1:1:1:1
  4. d. 9:3:3:1

Summary Introduction

Concept introduction: The allele is the variant of the gene. The allele can be dominant or recessive. The dominant allele is the one that will be expressed in the heterozygous condition where two different alleles of the same gene are present.  Phenotypic ratio refers to the ratio of the number of organisms in the generation that would express several phenotypes.

Explanation of Solution

Reasons for the correct statement:

The parents are homozygous dominant PPTT (purple flower (PP) and long- stemmed (TT)) and homozygous recessive pptt (white flower (pp) and short- stemmed (tt)). The F1 generation will be PpTt.  The F1 generation is self- crossed to give the F2 generation. The F2 generation will give the phenotypic ratio 9:3:3:1.

Option d. is given as “9:3:3:1”

As 9 purple flower tall stem, 3 purple flower short stem, 3 white flower long stem, and 1 white flower short stem give the phenotypic ratio 9:3:3:1 for dihybrid cross, option d...

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