Genetics: Analysis and Principles 4th Edition by Robert Brooker

Exercise 6

A crossover has occurred in the bivalent shown here.
What is the outcome of this single crossover event If a second crossover occurs somewhere between A and C , explain which two chromatids it would involve and where it would occur (i.e., between which two genes) to produce the types of chromosomes shown here:
A. A B C , A b C , a B c , and a b c
B. A b c , A b c , a B C , and a B C
C. A B c , A b c , a B C , and a b C
D. A B C , A B C , a b c , and a b c