Dihybrid cross Punnett square: RrYy × RrYy

An example figure from the Punnett Square generator.

A 4 by 4 Punnett square crossing RrYy × RrYy with gametes RY, Ry, rY and ry on each side, 16 offspring genotypes shaded by phenotype, a key for round yellow, round green, wrinkled yellow and wrinkled green, and the genotype and phenotype ratios below — A 4 × 4 dihybrid Punnett square crossing two pea plants heterozygous for seed shape and seed color, RrYy × RrYy. Each parent’s four gametes, RY, Ry, rY and ry, run across the top and down the side, and the 16 cells hold the offspring genotypes. Each phenotype has its own fill, with a key: gray for round yellow, hatching for round green, dots for wrinkled yellow, and white for wrinkled green. Both ratios are printed below.

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Answer key

Genotype ratio: 1 RRYY : 2 RRYy : 1 RRyy : 2 RrYY : 4 RrYy : 2 Rryy : 1 rrYY : 2 rrYy : 1 rryy
Phenotype ratio: 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green

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