Selection and Genetic Variation 1) selection against recessive alleles 04 63 02

Question

Selection and Genetic Variation 1) selection against recessive alleles 04 63 02 If alleles are recessive lethal, then selection can only act on them when they are homozygous 024t02 10 09 08 07 consider Dawson' s flour beetles started with population of all heterozygotes, +I II I is lethal, but +II is same as wildtype +/+ 05 4681012 9 Selection and Genetic Variation 1) selection against recessive alleles 04 Although selection initially 02 removed the I allele from population at a rapid rate, with each generation the frequency of declined more slowly 0 2 09 08 074 - when recessive alleles are rare, they are mostly hidden as heterozygotes +) - selection cannot efficiently 05 4681012 delete rare recessive alleles

Explanation / Answer

This means to say that :Selection against a recessive allele causes removal of deleterious recessive alleles from a population such that their frequencies becomes very low in a population.Selection against recessive alleles occurs very efficiently at first when they are in homozygous condition but then this gradually becomes slower.The reason is that after all the alleles in homozygous conditions are removed, allele frequency decreases and a larger proportion of the recessive alleles will be in heterozygote condition.This heterozygote condition is a sort of protection for the recessive alleles as selection fails to eliminate them entirely despite of being lethal.

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