Phenylketonuria is a genetic disorder due to a defect in the metabolism of which of the following?

Assertion $(A) :$ Phenylketonuria is an inborn error of metabolism and inherited as the autosomal dominant trait.
Reason $(R) :$ The disease is caused by mutation in the gene that codes for the enzyme phenylalanine hydroxylase.

$A$ colorblind man marries a woman who is the daughter of a colorblind father. What will be the status of their offspring regarding colorblindness?

Haemophilia $A$ is due to the absence of

Find the $ODD$ one out,with respect to $X$-linkage.

$A$ man and a woman,who do not show any apparent signs of a certain inherited disease,have seven children ($2$ daughters and $5$ sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following modes of inheritance do you suggest for this disease?