A colour blind man `(X^(C ) Y)` has a colour blind sister `(X^(C )X^(C ) )` and a normal brother (XY). What is the genotype of father and mother?

Options

A. `X^(C )Y, X^(C )X^(C )`
B. `X^(C ),Y, X^(C )X`
C. `XY, X^(C )X^(C )`
D. `XY, X^(C )X`

Answer

B

Explanation