Dihybrid Cross Calculator - Punnett Square

Use this dihybrid cross calculator to model inheritance for two traits (A/a and B/b) at the same time.

Pick mother and father genotypes for trait 1 and trait 2, then combine gametes in a 4x4 Punnett square to compute offspring genotypes.

Resulting probabilities are shown for the 9 possible genotype groups: AABB, AABb, AAbb, AaBB, AaBb, Aabb, aaBB, aaBb, and aabb.

For each cell, offspring genotype is formed by pairing alleles at each locus with dominant letter first (e.g., A with a gives Aa).