Dihybrid Cross Calculator
Dihybrid Cross
Cross two parents for two genes simultaneously
Formula
Dihybrid Cross: Each parent produces 4 gamete types. The 4×4 Punnett square yields 16 offspring combinations. For AaBb × AaBb: phenotype ratio = 9:3:3:1.
Frequently Asked Questions
What is a dihybrid cross?
A dihybrid cross examines the inheritance of two different genes simultaneously. It uses a 4×4 Punnett square (16 combinations) to predict genotype and phenotype ratios of offspring.
What is the expected ratio of a dihybrid cross between two heterozygotes?
When both parents are heterozygous for both genes (AaBb × AaBb), the expected phenotype ratio is 9:3:3:1 — 9 dominant-dominant, 3 dominant-recessive, 3 recessive-dominant, 1 recessive-recessive.
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