Colour blindness is caused by a single
Dominant gene in woman
Dominant gene in man
Recessive gene in man
Recessive gene in woman
A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is
The amino acid substituted in sickle cell anaemia is
The daughter born to haemophilic father and normal mother could be
A colour blind man marries the daughter of a colour blind person. Then in their progeny
Which of the following is not $X$-linked recessive