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 6SQ
Textbook Problem

Refer to question 5. Assuming complete dominance, the F2 generation will show a phenotypic ratio of ________.

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

Question No. 5

5. The offspring of the cross AA × aa are ________.

  1. a. all AA
  2. b. all aa
  3. c. all Aa
  4. d. half are AA and half are aa

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 AA and homozygous recessive aa. The F1 generation will be Aa. The F1 generation is self- crossed to give the F2 generation. The F2 generation will give the phenotypic ratio 3:1

Option a. is given as “3:1”

3 dominant phenotypes are expressed and only 1 recessive phenotype is expressed the phenotypic ratio for F2 generation is 3:1, option a. is correct.

Reasons for the incorrect statements:

Option b...

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