Breeding Calculator

Calculate offspring genotypes and phenotypes from genetic crosses using Punnett squares.

Parent Genotypes

Cross Type

Gene 1

Parent 1

Parent 2

Mendelian Ratios

Monohybrid Aa × Aa: 1:2:1 genotype, 3:1 phenotype

Dihybrid AaBb × AaBb: 9:3:3:1 phenotype

Phenotype Ratio (Gene 1)

Dominant

3

75%

Recessive

1

25%

Punnett Square (Gene 1)

	A	a
A	AA	Aa
a	Aa	aa

Genotype Frequencies

Aa2/4 (50%)

AA1/4 (25%)

aa1/4 (25%)