Question

If a man who is colour blind marries a woman who is pure normal for colour vision, what are the chances of their sons having colour blindness?

• A. 100%
• B. 50%
• C. 0%
• D. 75%

Answer 1

Answer: (C)

0%

Colour blind man - $X^c$ Y
Normal female - X X
Gametes of male parent: $X^c$ and Y
Gametes of female parent: X
Crossing: X X and$X^c$ Y
It produces offsprings with XY (normal male) X$X^c$ (carrier female) XY (normal male X$X^c$(carrier female).

So, the correct answer is option C.