A) A certain rabbit population has 1000 individuals, some black and some brown,

Question

A) A certain rabbit population has 1000 individuals, some black and some brown, with black dominant over brown. Of the 1000 rabbits, 400 are brown. Assuming Hardy-Weinberg equilibrium, what is the frequency of the black allele?

B) In a population of individuals, the genotypic frequencies of a two-allele locus (A) are

f(AA) = 0.6
f(Aa) = 0.2
f(aa) = 0.2

What is the frequency of the A allele?

C) Give three criteria that must be fulfilled by a population, before you can assume it is in Hardy-Weinberg equilibrium.

Explanation / Answer

(A) Since black is dominant over brown, brown is recessive over black. Let p be the allele frequency of brown allele, q be the allele frequency of black allele q^2 = 400/1000 q^2 = 0.4 q = 0.632 Since p + q = 1 p = 1-0.632 = 0.368 B) Since (AA) = 0.6 p^2 = 0.6 p = 0.774 C) (1) Random mating (2) No mutation (3) No migration

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