Free Genetics Tool
Punnett Square Calculator
Click the headers to edit parent alleles
×
AA
Aa
Aa
aa
Genotype Ratio
AA: 1/4
Aa: 2/4
aa: 1/4
Phenotype Ratio
Dominant:3/4(75%)
Recessive:1/4(25%)
Tip: Click any header cell to change the allele. Uppercase letters = dominant alleles, lowercase = recessive. The grid auto-computes offspring genotypes.
Parent 1
Parent 2
Dominant
Recessive