Round pea shape is dominant over wrinkled pea shape. If a round pea has a wrinkled parent, the round pea is:

Question

Quizplus · Accepted Answer

Since round pea shape is dominant over wrinkled pea shape, a round pea with a wrinkled parent must be heterozygous. The parent that was wrinkled must have been homozygous recessive (rr) since it only passed on a recessive allele to the offspring. Therefore, the possible genotypes for the offspring are Rr (heterozygous) or rr (homozygous recessive). Since the question asks specifically for the round pea's genotype, the only possible answer is B (Rr).

Round Pea Shape Is Dominant Over Wrinkled Pea Shape