Hardy–Weinberg: Genotype Frequencies Calculator
🧬 Genetics & evolution. Use the Hardy–Weinberg: genotype frequencies formula to find homozygous dominant p², heterozygous 2pq, homozygous recessive q²: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Homozygous dominant p² | no unit |
| Heterozygous 2pq | no unit |
| Homozygous recessive q² | no unit |
Worked example
Find the homozygous dominant p² when Heterozygous 2pq = 0.42, Homozygous recessive q² = 0.09.
Using p² + 2pq + q² = 1: Homozygous dominant p² = 0.49.
Frequently asked questions
What is the formula for Hardy–Weinberg: genotype frequencies?
p² + 2pq + q² = 1.
What do the letters stand for, and what units are used?
Homozygous dominant p², Heterozygous 2pq, Homozygous recessive q².
How do you calculate homozygous dominant p²?
Put the values into p² + 2pq + q² = 1. For example, with Heterozygous 2pq = 0.42, Homozygous recessive q² = 0.09, homozygous dominant p² = 0.49.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (homozygous dominant p², heterozygous 2pq, homozygous recessive q²) and fill in the others: it rearranges the formula for you.
