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When a colour blind woman marries a normal man, what is the probability of their...

When a colour blind woman marries a normal man, what is the probability of their son being colour blind?

25%

100%

50%

The correct answer is B.

If a woman is colorblind, that means she has the nonworking gene on both X chromosomes.

Since sons almost always get their only X chromosome from their mom, chances are they will be colorblind too

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