In Peas, the Smooth Allele Is Dominant Over the Wrinkled

Multiple Choice

In peas, the smooth 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 smooth peas. What are the genotypes of the parents in this cross?

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