An initial crossover event will occur between A and B, as indicated in the corresponding image.  After this initial event occurs, a second crossover event occurs (not illustrated) involving the products of the first crossover event.   a.  Given this chromosome organization, A B c, A b c, a B C, and a b C, which two chromatids of the bivalent were involved  chromatid 1 chromatid 2 chromatid 3 chromatid 4 and between which genes gene A gene B gene C did the second crossover event occur to produce the indicated chromosomes?       b.  Returning to the original crossover depicted in the image, given this chromosome organization, A B C, A B C, a b  c, and a b c, which two chromatids of the bivalent were involved chromatid 1 chromatid 2 chromatid 3 chromatid 4 and between which genes gene A gene B gene C did the second crossover event occur to produce the indicated chromosomes?

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations
Section: Chapter Questions
Problem 3QP: A colleague e-mails you saying that she has identified an interesting chromosome variation at 21q13....
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An initial crossover event will occur between A and B, as indicated in the corresponding image.  After this initial event occurs, a second crossover event occurs (not illustrated) involving the products of the first crossover event.  

a.  Given this chromosome organization, A B c, A b c, a B C, and a b C, which two chromatids of the bivalent were involved 

chromatid 1 chromatid 2 chromatid 3 chromatid 4

and between which genes

gene A gene B gene C

did the second crossover event occur to produce the indicated chromosomes?  

 

 

b.  Returning to the original crossover depicted in the image, given this chromosome organization, A B C, A B C, a b  c, and a b c, which two chromatids of the bivalent were involved

chromatid 1 chromatid 2 chromatid 3 chromatid 4

and between which genes

gene A gene B gene C

did the second crossover event occur to produce the indicated chromosomes?

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