If R is dominant to r, the offspring of the cross of RR with rr will:

A. be homozygous.
B. display the same phenotype as the RR parent.
C. display the same phenotype as the rr parent.
D. have the same genotype as the RR parent.
E. have the same genotype as the rr parent.

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... the mom is rr. The dad can only donate an R and the mom can only donate an r. So the offspring can only be Rr.

If you have an Rr offspring, ...