Given genotype frequencies, calculate allele frequencies in a gene pool !

Alleles = A, a

Genotypes = AA, Aa, aa

Frequency of allele A: f (A) = f (AA) + 1/2 f (Aa)

Frequency of allele a: f (a) = f (aa) + 1/2 f (Aa)

f(A) + f(a) = 1.0

p + q = 1.0 (allele frequencies)

p = 1 - q or, q = 1 - p

AA

Aa

Aa

aa

A

a

A

a

p2 + 2pq + q2 = 1 f [AA] + 2 [f(Aa)] + f [aa] = 1

26a

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