In a normal couple,half of the sons are hemophilic and half of the daughters are carriers. Where is the gene located?

Polydactyly in humans is due to:

Which disorder is caused when the synthesis of the $\beta$-globin chain of hemoglobin is affected due to a single gene $HBB$,leading to a quantitative change in the hemoglobin structure?

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 $R$.
$\quad\quad P \quad\quad Q \quad\quad R$

Wilson detected the colour blindness disease in

If a color-blind woman marries a man with normal vision,their sons will be .....