A son of a colourblind father and normal homozygous mother marries to a daughter of normal father and heterozygous mother than their children will be

Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Pick out the correct statements.

$I.$ Haemophilia is a sex-linked recessive disease

$II.$ Down's syndrome is due to aneuploidy

$III.$ Phenylketonuria is an autosomal dominant gene disorder

$IV.$ Phenylketonuria is an autosomal recessive gene disorder

$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder

A man known to be victim of haemophilia marries a normal woman whose father was known to be a bleeder. Then it is expected that