Allele Frequency Calculator
From Genotype Counts
Calculate allele frequencies from observed numbers of each genotype
From Recessive Phenotype Frequency
Calculate allele frequencies when you know the proportion of recessive phenotypes
Formula
p = (2×nAA + nAa) / (2×N), q = 1 - p. Genotype frequencies under Hardy-Weinberg: p² (AA) + 2pq (Aa) + q² (aa) = 1.
Frequently Asked Questions
What are allele frequencies?
Allele frequencies describe how common each version of a gene (allele) is in a population. The frequency of the dominant allele is denoted p and the recessive allele q, where p + q = 1.
How do you calculate allele frequency from genotype counts?
Count all copies of each allele: p = (2×AA + Aa) / (2×total individuals). Since there are only two alleles, q = 1 - p.