In a large, randomly mating population of giraffes with no movement of individua
ID: 37963 • Letter: I
Question
In a large, randomly mating population of giraffes with no movement of individuals in and out of the population and no mutation, the two alleles at one gene, A and a, do not affect survival or reproduction of the giraffes. The two alleles at another gene, S and B, do affect survival to adulthood by affecting the degree to which giraffes are subject to parasitism by ticks and biting flies. BB individuals have bitter blood, which repels parasites, and survive best. SB individuals have neutral tasting blood and survive 73% as well as do BB individuals. SS individuals have sweet blood and attract parasites; they survive only 22% as well as do BB individuals.
a. In a population of ADULT giraffes, the frequency of individuals with the AA genotype is 0.38. Calculate the allele frequencies of both A and a alleles.
b. Compute the genotype frequencies of Aa and aa
Explanation / Answer
by the Hardy-Weinberg equation
the adult frequency of individual with genotype AA = 0.38
A- so allele frequency of A = p = sqaure root of 0.38 = 0.62
allele frequency of a = q = 1-p = 1-0.62 = 0.38
B- genotype frequency of AA = p2*p2 = 0.02
genotype frequency of Aa = 2 p q = 2 * 0.38 * 0.62 = 0.47
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