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Chapter 13: Q. 1 (page 342)

Figure 13.3 In a test cross for two characteristics such as the one shown here, can the predicted frequency of recombinant offspring be 60 percent? Why or why not?

Short Answer

Expert verified

No.

Step by step solution

01

Step. 1 Introduction

The crossover of an F1 offspring among a dominant phenotype including its homozygous recessive parent is referred to as a test cross. This test crossing is performed to establish if the dominant individuals are homozygotes or heterozygotes.

02

Step. 2 Explanation

No, the predicted frequency of recombinant generation varies between 0% (for linked characteristics ) to 50% (for unlinked characteristics).

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Most popular questions from this chapter

Which of the following statements is true? a. Recombination of the body color and red/cinnabar eye alleles will occur more frequently than recombination of the alleles for wing length and aristae length. b. Recombination of the body color and aristae length alleles will occur more frequently than recombination of red/brown eye alleles and the aristae length alleles. c. Recombination of the gray/black body color and long/short aristae alleles will not occur. d. Recombination of the red/brown eye and long/short aristae alleles will occur more frequently than recombination of the alleles for wing length and body color.

The first suggestion that chromosomes may physically exchange segments came from the microscopic identification of ________.

a. synapsis

b. sister chromatids

c. chiasmata

d. alleles

Figure 13.6Which of the following statements about nondisjunction is true?

a. Nondisjunction only results in gametes with n+1or n-1chromosomes.

b. Nondisjunction occurring during meiosis II results in 50percent normal gametes.

c. Nondisjunction during meiosis I results in 50percent normal gametes.

d. Nondisjunction always results in four different kinds of gametes

Abnormalities in the number of X chromosomes tends to have milder phenotypic effects than the same abnormalities in autosomes because of _______

a. deletions

b. nonhomologous recombination

c. synapsis

d. X inactivation

By definition, a pericentric inversion includes the ________.

a. centromere

b. chiasma

c. telomere

d. synapse
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