In Peas, the Round Allele Is Dominant Over the Wrinkled

Multiple Choice

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?

A) RR × rr
B) RR × Rr
C) Rr × rr
D) Rr × Rr
E) rr × rr