How to use the allele frequency from genotype counts calculator
Find the allele frequencies of a gene from counts of each genotype in a sample. Enter homozygous dominant count, heterozygous count, homozygous recessive count in the fields above; the frequency of allele a (p), frequency of allele a (q) are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “allele frequency from genotypes”, “p and q from counts”, “genotype counts allele frequency”, “calculate allele frequency from genotype counts”, “find frequency of allele a”.
Formula
Variables
- AA — Homozygous dominant count (individuals)
- Aa — Heterozygous count (individuals)
- aa — Homozygous recessive count (individuals)
Worked example
With homozygous dominant count = 30 individuals, heterozygous count = 50 individuals, homozygous recessive count = 20 individuals, the calculator gives frequency of allele a (p) ≈ 0.55; frequency of allele a (q) ≈ 0.45.
Frequently asked questions
What is the allele frequency from genotype counts calculator used for?
Find the allele frequencies of a gene from counts of each genotype in a sample. It helps with questions such as “allele frequency from genotypes”, “p and q from counts”, “genotype counts allele frequency”.
What is the formula for the allele frequency from genotype counts calculation?
Frequency of allele A (p) = (2 × AA+Aa) / (2 × (AA+Aa+aa)). Frequency of allele a (q) = 1-[Frequency of allele A (p)]. Here AA is homozygous dominant count (individuals), Aa is heterozygous count (individuals), aa is homozygous recessive count (individuals).
What inputs do I need for the allele frequency from genotype counts calculator?
You need homozygous dominant count in individuals, heterozygous count in individuals, homozygous recessive count in individuals. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the allele frequency from genotype counts calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the allele frequency from genotype counts result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.