Question

In a dihybrid cross between two heterozygous pea plants (RrYy × RrYy), where R (round seed) is dominant over r (wrinkled) and Y (yellow) is dominant over y (green), what phenotypic ratio is expected among the offspring, and how many of the 16 possible gametic combinations would show the round-seed, green-colour phenotype?

A 9:3:3:1 ratio; 1 combination round-green
B 1:2:1 ratio; 3 combinations round-green
C 9:3:3:1 ratio; 9 combinations round-green
D 3:1 ratio; 3 combinations round-green
E 9:3:3:1 ratio; 3 combinations round-green
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