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In population genetics, the genotype frequency is the frequency or proportion (i.e. 0 < f < 1) of genotypes in a population.

It may be denoted thus:


Compare allele frequency.

The Hardy-Weinberg law predicts genotype frequencies from allele frequencies under certain conditions, in which case:

f(\mathbf{AA}) = p^2
f(\mathbf{Aa}) = 2pq
f(\mathbf{aa}) = q^2

Genotype frequencies may be represented by a De Finetti diagram.

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