Dihybrid cross = involves inheritance of 2 characteristics
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In Pisum sativum, a round seed is produced by a dominant allele (R), while wrinkled seeds are produced by the recessive allele (r). Yellow seeds are produced by the dominant allele (Y), while green seeds are produced by the recessive allele (y).
In a cross between a homozygous round, yellow plant and a wrinkled green plant, what is the F1 and F2 phenotypic and genotypic ratio?
Key: R = round seed Y = yellow seeds
r = wrinkled seed y = green seeds
P1: round yellow seed x wrinkled green seed
Gametes: R, Y r, y
F1: Genotypic Ratio: 100% heterozygous RrYy
Phenotypic Ratio: 100% round, yellow seeds
F2: Crossing F1 plants among themselves produces an F2 generation.
P2: round yellow seed x round yellow seeds:
RY, Ry, rY, ry RY, Ry, rY, ry