Question

If a colourblind man marries with a woman who is homozygous for normal colour vision, the probability of their son being colourblind is 

(a) 0 

(b) 0.5 

(c) 0.75 

(d) 1

Answer 1

Correct option is (a) 0

The cross for the question is

Since the male offsprings get X-chromosome from their mother who is normal homozygous, thus, none of the son would be colourblind.