If two true breeding parents are crossed (RR x rr) in the parental generation, what will the phenotypic ratio be in the F2 generation assuming the F1 progeny is self-fertilized. "R" will be round peas and "r" will be wrinkled peas.
A. 100% Round
B. 75% round : 25% wrinkled
C. 100% wrinkled
D. 50% round : 50% wrinkled