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21. If R represents a dominant gene for round and r represents a recessive gene for wrinkled, which will be the genotypic ratio of the offspring?

A. 25RR:25 Rr:50rr
B. 25RR:50Rr:25rr
C. SORR:25Rr:25rr
D. 75RR:25 Rr:Orr​