If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is
If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is
- [NEET 2016]
- A
$0$
- B
$0.5$
- C
$0.75$
- D
$1$
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- [AIPMT 1990]