Haemophilia is example of
Infectious disease
Sex linked recessive trait
Autosomal linked recessive
None of the above
Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
Carrier of genes of colour blindness are present in
A normal woman, whose father was colour-blind is married to a normal man. The sons would be
A boy is colour blind, in his two sisters one is colour blind and one is carrier $(normal)$. Then who is colour blind in his family
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?