The figure (Figure 1) shows original chromosomes at the top and paired chromosom

Question

The figure (Figure 1) shows original chromosomes at the top and paired chromosomes undergoing crossing over at the bottom. You will be determining how the chromosomes connect after the crossover event has finished. Be sure to begin with the left end of each chromosome.

Select the correct combination describing the left end (unprimed number) and right end (primed number) of the following chromosome found in the gametes

A. 1-3 B. 1-3' C. 1-2' D. 1'-1 E. 1-1' Inversion Pairing Paracentric inversion heterozygote A B C D E A B C D E Inversion loop, including crossover

Explanation / Answer

"ABCDE" is the gene order of the top most chromosome. This has not undergone cross-over. It's left end is 1 and the right end is 1'.

So, the correct answer is E (1-1').

Note:

"ABCde" is the second chromosome. Its left end is 1 and right end is 3'.

Third chromosome is "abcDE"; whose left end will be 3 and right end will be 2'.

The last chromosome will be "abcde"; whose left and right ends will be 4-4' respectively.

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