If a colour blind man marries a woman who is homozygous for normal vision, the probability of their son being colour blind is .........
If a colour blind man marries a woman who is homozygous for normal vision, the probability of their son being colour blind is .........
- A
$100\%$
- B
$0\%$
- C
$0.5\%$
- D
$25\%$
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