Consider a pair of homologous chromosomes heterozygous for three genes (e.g. ABC

Question

Consider a pair of homologous chromosomes heterozygous for three genes (e.g. ABC/abc) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2 (ABC); and the sister chromatids of the other homolog be numbered 3 and 4 (abc).

Assume a double crossover occurs in this pair of chromosomes that results in chromatids of the genotype Abc, ABC, aBc and abC. If the first crossover (the one between A and B) involves chromatids 1 & 4, which chromatids could be involved in the second crossover?

Select one:

a. 1 & 2

b. 1 & 3

c. 1 & 4

d. 1 & 3 or 1 & 4 or 2 & 3 or 2 & 4

e. any two of the four chromatids

Explanation / Answer

the chromatids could be involved in the second crossover are 1 & 3 or 1 & 4 or 2 & 3 or 2 & 4

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