A colour blind man marries a woman with normal vision whose father was colour blind. What proportion of their daughters will be colour blind?
- A. None
- B. Half
- C. A quarter
- D. All of them
Explanation
The woman must be a carrier since she inherited her affected father's X. The colour blind father passes his affected X to every daughter, and the mother passes her affected X to half of them, so half the daughters are colour blind and half carriers.
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