In Mendel's experiments with garden pea,round seed shape $(RR)$ was dominant over wrinkled seeds $(rr)$,and yellow cotyledon $(YY)$ was dominant over green cotyledon $(yy)$. What are the expected phenotypes of the $F_1$ generation when a homozygous round yellow plant $(RRYY)$ is crosseded with a homozygous wrinkled green plant $(rryy)$?
- ARound seeds with yellow cotyledons
- BOnly round seeds with green cotyledons
- COnly wrinkled seeds with yellow cotyledons
- DOnly wrinkled seeds with green cotyledons
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