Phenylketonuria is an inborn error of metabolism that is inherited as:

$A$ man with normal vision whose father was colourblind marries a woman whose father was also colourblind. Suppose their first child is a daughter,what are the chances of this child being colourblind (in $\%$)?

Which of the following characteristics is $NOT$ associated with Phenylketonuria $(PKU)$?

Select the correct options for the given statements:
Statements:
$X$: Formation of Haemoglobin is controlled by two closely linked genes $HBA1$ and $HBA2$ on chromosome $16$ of each parent.
$Y$: $\beta$-Thalassemia is controlled by a single gene $HBB$ on chromosome $21$ of each parent.

The following pedigree chart shows:

$A$ woman whose father was an albino marries an albino man. What will be the ratio of their offspring?