In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?

Question

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The round pea plant must be homozygous dominant (RR) to ensure all offspring are round, as crossing with a homozygous recessive (rr) would otherwise produce some wrinkled peas if the round parent were heterozygous (Rr).

In Peas, the Round Allele Is Dominant Over the Wrinkled