$A$ girl of normal vision whose father was colourblind marries a man of normal vision whose father was also colourblind. What percentage of their sons would be colourblind?

Which of the following is not a Mendelian disorder?

Autosomal dominant disorder $- P$
Autosomal recessive disorder $- Q$
$X$-linked recessive disorder $- R$
$I -$ Haemophilia,$II -$ Sickle cell anaemia,$III -$ Phenylketonuria,
$IV -$ Thalassaemia,$V -$ Colour blindness,$VI -$ Myotonic dystrophy
Select the correct option for $P, Q$ and $R$.
$\quad\quad P \quad\quad Q \quad\quad R$

Why is the frequency of red-green colour blindness many times higher in males than in females?

If a father is colorblind and the mother's father is colorblind,what is the probability of colorblindness in their offspring?

An albino father's daughter marries an albino man. What will be the ratio of their offspring?