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Dihybrid Cross 9:3:3:1 Calculator

Expected offspring counts for a heterozygous-by-heterozygous dihybrid cross.

Compute the expected offspring counts in each phenotypic class (9:3:3:1) for a dihybrid cross between two heterozygotes (e.g. RrYy × RrYy), given the total number of offspring.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

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Formula

Expected counts: 9/16 dominant-dominant, 3/16 dominant-recessive, 3/16 recessive-dominant, 1/16 recessive-recessive.

In depth

Compute the expected offspring counts in each phenotypic class (9:3:3:1) for a dihybrid cross between two heterozygotes (e.g. RrYy × RrYy), given the total number of offspring.