A girl of normal vision whose father was clourblind marries a man of normal vision whose father was also colourblind .their sons would be (o ftotal number of sons)

Options

A. All colourblind
B. 50% colourblind
C. All normal
D. 25% colourblind

Answer

B

Explanation

Infact the girl with normal vision is carrier because her father is colourblind (daughter of colurbind father are either colourblind or carrir ) and when she marries a normal man the possibly of their sons being colourblind is `50%` because the genotype of parents is XX and XY, so only half of the possible combinations of XY have the X - linked recessive gens which exhibit the disease.