Table 18-1: Hardy–Weinberg Genotype Frequencies for a Locus with Three Alleles A₁, A₂, and A₃ with frequencies 0.5, 0.3, and 0.2, Respectively

Genotype	Expectation	Frequency
A₁A₂	p²₁	0.25
A₂A₂	p²₂	0.09
A₃A₃	p²₃	0.04
A₁A₂	2_p1p2	0.30
A₁A₃	2_p1p3	0.20
A₂A₃	2_p2p3	0.25
Sum		1.00