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Suppose you have a population of flour beetles with 1,000 individuals.Normally the beetles are red;however,this population is polymorphic for a mutant autosomal body color,black,designated by bb.Red is dominant to black,so BB and Bb genotypes are red.Assume the population is at Hardy-Weinberg equilibrium,with equal frequencies of the two alleles.
-What would be the expected frequencies of the red and black phenotypes?
A) 0.25 red;0.75 black
B) 0.5 red;0.5 black
C) 0.75 red;0.25 black
D) All red
E) All black

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Quizplus · Accepted Answer

In Hardy-Weinberg equilibrium with equal allele frequencies (p = q = 0.5), the genotype frequencies are p^2 (BB), 2pq (Bb), and q^2 (bb). Thus, 0.25 BB, 0.5 Bb, and 0.25 bb. Since BB and Bb are red, the red phenotype frequency is 0.25 + 0.5 = 0.75, and the black phenotype frequency is 0.25.

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