In the figure above, a new beneficial allele, B, arises on a chromosome containi

Question

In the figure above, a new beneficial allele, B, arises on a chromosome containing the ordered loci A, b, C, D, and E, depicted in the top panel. After reproduction, those chromosomes possessing the B allele increase in frequency. Over time, recombination breaks up the association of the B allele with the A, C, D, and E allele. The first pair of allele combinations to be broken up will be:

a.

B and E.

b.

B and C.

c.

B and A.

d.

All will break up at an equal rate.

e.

B and D.

a.

B and E.

b.

B and C.

c.

B and A.

d.

All will break up at an equal rate.

e.

B and D.

Explanation / Answer

Genes that are closer to each other are the last to cross over and the genes with maximum distance are the ones which crossover first. The gene order given is A, B, C, D, E. As you can see B gene is very close to A and C and D compared to E. So, the first pair of allele combinations to be broken up would be B and E.

So, the answer is (a).

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