by MarkAllele Frequency CalculatorCalculate the frequency of alleles in a population based on genotype counts. Homozygous Dominant (AA) ? Number of individuals with two dominant alleles (e.g., 100). Heterozygous (Aa) ? Number of individuals with one dominant and one recessive allele (e.g., 200). Homozygous Recessive (aa) ? Number of individuals with two recessive alleles (e.g., 150). Calculate ResetEnter genotype counts, then click “Calculate”. JavaScript is disabled. Please enable it to use the calculator.