A husband and wife have normal vision, although both of their fathers are red - green colour blind , which is inherited as an x - linked recessive trait .
What is the probability that their first child will be ?
i. A normal son
ii. A carrier daughter
iii. A colour - blind son
iv. A colour - blind daughter

Options

A. `i=1/4,ii=1/4,iii=1/4,iv=1/4`
B. `i=1/4,ii=1/4,iii=1/4,iv=0/4`
C. `i=0/4,ii=1/2,iii=1/4,iv=1/4`
D. `i=1/4,ii=1/2,iii=1/4,iv=0`

Answer

B