Question

An experiment was done with two pairs of linked loci—A,a and B,b with a recombination rate (r) of 0.1 and C,c and D,d with r of 0.01—to see how quickly sexual reproduction and random mating would break down linkage disequilibrium (LD). If experiments were run for 25 generations, starting with a maximum LD between the loci of 0.25, which two linked loci would have a faster decay of LD?

a) locus A,a and locus B,b
b) locus C,c and locus D,d
c) They would have equal decline in the LD.

d)Twenty-five generations is not a sufficient time to observe any changes in the D value.

explain

Answer 1

Linkage disequilibrium is the non-random association of alleles atseparate loci located on the same chromosome.

the locus Aa & Bb has the facster decay in comparison to the Cc& Dd . as it has recombination rate 0.1 which over the generation b/w the loci results in disequilibrium dacay , asthe rate of recombination  for Cc & Dd is very low . so its decay is also slower . With high recombination rate the Linkage diequilibrium dacay is also faster .

So , the correct answer is Aa and Bb