In peas, the yellow allele is dominant over the green allele. A plant with yellow peas was crossed to a plant with green peas. The resulting plants were 50% yellow and 50% green. What are the genotypes of the parents in this cross?

Question

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The parent with yellow peas must be heterozygous (Yy) because the offspring include both yellow and green peas, indicating that a recessive allele (y) was contributed by the yellow parent. The green parent must be homozygous recessive (yy) because green is a recessive trait.

In Peas, the Yellow Allele Is Dominant Over the Green