Haemophilia is a

A person is suffering from disease phenylketonuria, which is an autosomal recessive disease. Which of these is lacking in the person?

The point mutations $A$ to $G, C$ to $T, C$ to $G$ and $T$ to $A$ in $DNA$ are

$A$ : Antlers in male deer are sex influenced traits.
$R$ : These are controlled by autosomal genes which are influenced by the sex of bearer

Which is the example of inhibitory gene