1. Recall that the fourth chromosome of Drosophila melanogaster does not recombine during meiosis…

1. Recall
that the fourth chromosome of Drosophila melanogaster does not recombine during meiosis. The lack of
genetic polymorphism on this chromosome has been interpreted as the product of a selective sweep. If the fourth chromosome had normal rates of recombination, would you expect the level of polymorphism to be different? Why?

2. As
we have seen, inbreeding can reduce offspring fitness by exposing deleterious
recessive alleles. However, some animal breeders practice generations of
careful inbreeding within a family, or line breeding, and surprisingly many
of the line-bred animals,

1. Recall
that the fourth chromosome of Drosophila melanogaster does not recombine during meiosis. The lack of
genetic polymorphism on this chromosome has been interpreted as the product of a selective sweep. If the fourth chromosome had normal rates of recombination, would you expect the level of polymorphism to be different? Why?

2. As
we have seen, inbreeding can reduce offspring fitness by exposing deleterious
recessive alleles. However, some animal breeders practice generations of
careful inbreeding within a family, or line breeding, and surprisingly many
of the line-bred animals, from champion dogs to prize cows, have normal health
and fertility. How can it be possible to continue inbreeding for many
generations without experiencing inbreeding depression due to recessive
alleles? (Hint: Consider some of the differences between animal breeders and
natural selection in the wild.) Generally, if a small population continues to
inbreed for many generations, what will happen to the frequency of the deleterious
recessive alleles over time?

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