In a plant with genotype $RrYy$,if self-pollination occurs,what will be the ratio of the following genotypes: $RRYY, RrYY, RRYy, RrYy$?
- A$1:2:2:4$
- B$1:2:2:1$
- C$1:1:1:1$
- D$2:2:2:1$
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