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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

Assume a pericentric inversion occurred in one of two homologs prior to meiosis. The other homolog remains normal. During meiosis, what structure鈥攊f any鈥攚ould these homologs assume in order to pair accurately along their lengths?

a. V formation

b. cruciform

c. loop

d. pairing would not be possible

The genotype XXY corresponds to

a. Klinefelter syndrome

b. Turner syndrome

c. Triplo-X

d. Jacob syndrome

X-linked recessive traits in humans (or in Drosophila) are observed ________.

a. in more males than females

b. in more females than males

c. in males and females equally

d. in different distributions depending on the trait

If the allele encoding polydactyly (six fingers) is

dominant why do most people have five fingers?

a. Genetic elements suppress the polydactyl gene.

b. Polydactyly is embryonic lethal.

c. The sixth finger is removed at birth.

d. The polydactyl allele is very rare in the human

population.

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
See all solutions

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