Colour blindness in man is
Due of deficiency of vitamin $A$
Due of absence of visual purple in retina
Due to absence of rods in retina
A sex linked abnormality
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
Gene for colourblindness is located on
Pattern baldness, moustaches and beard in human males are examples of
The daughter born to haemophilic father and normal mother could be
Persons who are colour blind cannot distinguish