In Mendel's monohybrid cross experiment,the phenotypic ratio is $P$ and the genotypic ratio is $Q$. Select the correct option for $P$ and $Q$.
$\quad \quad \quad P \quad \quad \quad Q$
$\quad \quad \quad P \quad \quad \quad Q$
- A$1: 2: 1 \quad 3: 1$
- B$1: 2: 1 \quad 1: 2: 1$
- C$3: 1 \quad 3: 1$
- D$3: 1 \quad 1: 2: 1$
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