Allele Frequency Calculator

Your details

Choose how you want to supply your population data. Genotype counts is the most informative mode because it lets the calculator run a chi-square test.
Number of individuals that are homozygous dominant (AA).
individuals
Number of individuals that are heterozygous (Aa, also called carriers for recessive traits).
individuals
Number of individuals that are homozygous recessive (aa).
individuals
Dominant allele frequency (p)In Hardy-Weinberg Equilibrium
0.7

Frequency of the dominant allele A in the population (0 to 1)

Recessive allele frequency (q)0.3
Expected AA (p²)0.49
Expected Aa (2pq)0.42
Expected aa (q²)0.09
Chi-square statistic0
HWE resultIn HWE (p > 0.05)
Sample size (N)100
p (dominant allele)0.7
q (recessive allele)0.3

p = 0.7000, q = 0.3000 in this population.

  • The dominant allele frequency is p = 0.7000 (70.00%), and the recessive allele frequency is q = 0.3000 (30.00%).
  • Under Hardy-Weinberg equilibrium you would expect 49.00% AA, 42.00% Aa, and 9.00% aa individuals.
  • Chi-square = 0.0000 (df = 1, critical value 3.841): no significant departure from Hardy-Weinberg equilibrium detected at alpha = 0.05.
  • Approximately 1 in 2 individuals in a population at HWE would be heterozygous carriers (Aa).

Next stepTo test whether allele frequencies are changing over time, compare results from the same population measured across multiple generations.

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