Which of the following is not true of haemophilia?
Royal disease
Bleeder's disease
$X-$linked disorder
$Y-$linked disorder
All sons of a couple are colourblind because
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
Assertion : Haemophilia is a recessive sex linked disease.
Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.
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