Let S = smooth pea and s = wrinkled pea; Y = yellow pea and y = green pea.What are the different possible genotypes of the gametes produced by a plant that is heterozygous for both characters?

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Quizplus · Accepted Answer

The plant is heterozygous for both characters, which means it has one dominant and one recessive allele for each trait. Therefore, the possible gametes are formed by separating the alleles and putting one allele for each trait in each gamete. 
For the smooth/wrinkled trait, the possible gametes are S or s, and for the yellow/green trait, the possible gametes are Y or y. 
Therefore, the possible genotypes of the gametes are SY, Sy, sY, and sy. Option D lists all of these possible genotypes.

Let S = Smooth Pea and S = Wrinkled Pea;