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

Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
 

Which of the following occurs due to the presence of autosome linked dominant trait?

Mendelian disorder may be of

A woman has a haemophilic son and three normal children. Her genotype and that of her husband with respect to this gene would be