Medium
$A$ - Sickle-cell anaemia is a sex-linked recessive trait.
$R$ - This disease is controlled by more than two pairs of alleles.
$R$ - This disease is controlled by more than two pairs of alleles.
- A$A$ and $R$ both correct
- B$A$ correct and $R$ incorrect
- C$A$ and $R$ both incorrect
- D$A$ incorrect and $R$ correct
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