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Chapter 13: Q. 5 (page 343)

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

a. synapsis

b. sister chromatids

c. chiasmata

d. alleles

Short Answer

Expert verified

The correct option is C.

Step by step solution

01

Step. 1 Introduction

The creation of chiasma allows for the interchange of genetic information across non-sister chromatids of homologous pairs. Consequently, chiasma seems to be a mechanism for trait recombination and therefore variability in multicellular organisms.

02

Step. 2 Explanation for correct option.

Chiasmata seem to be X-shaped forms created throughout meiosis as a result of the point of contact among coupled chromatids.

03

Step. 3 Explanation for incorrect option.

Option a. During early meiosis, synapsis occurs, which is the grouping of sister chromatids, one per parent.

Option b. Sister chromatids are duplicates of one another generated through Replication of dna.

Option d. Alleles are one among two or even more DNA sequences found at a specific gene locus.

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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

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

Which recombination frequency corresponds to perfect linkage and violates the law of independent assortment?

a. 0

b. 0.25

c. 0.50

d. 0.75

Explain how the Chromosomal Theory of Inheritance helped to advance our understanding of genetics.

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?
See all solutions

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