In Mendel's dihybrid cross,the number of genotypes and phenotypes obtained in the $F_2$ generation are $P$ and $Q$ respectively. Identify $P$ and $Q$.
- A$P = 16, Q = 4$
- B$P = 3, Q = 2$
- C$P = 9, Q = 4$
- D$P = 4, Q = 4$
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