Punnett Square Calculator
Calculate offspring genotype probabilities (AA, Aa, aa) and visualize a 2x2 Punnett square for one-trait crosses.
Use this Punnett square calculator to predict genotype and phenotype probabilities from parental genotypes.
Choose mother and father genotypes (AA, Aa, aa), then combine parental alleles in a 2x2 Punnett square.
Genotype probabilities are found by counting AA, Aa, and aa outcomes and dividing by total outcomes.
Phenotype mapping for dominant/recessive mode is: AA -> A, Aa -> A, aa -> a.
Heterozygous means two different alleles (Aa), while homozygous means identical alleles (AA or aa).
Learning genetics? Enter parent genotypes to quickly predict offspring traits with our Punnett Square calculator!
A - Dominant allele
a - Recessive allele
Mother's genotype
Father's genotype
Punnett Square
| ♂\♀ | A | A |
|---|---|---|
| A | AA | AA |
| a | Aa | Aa |
Genotype to phenotype
| Genotype | Phenotype |
|---|---|
| AA | A |
| Aa | A |
| aa | a |