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A colour-blind man marries a woman whose father was colour-blind but whose mother had no family history of the disorder. What is the chance that their daughter will be colour-blind?
AZero
BOne in four
COne in two
DAll daughters affected
Answer & Solution
Correct answer: C. One in two
The man is X^c Y. The woman is an obligate carrier X^C X^c since her father transmitted X^c to her. Daughters get X^c from the father and either X^C or X^c from the mother. Half the daughters are X^c X^c colour-blind.
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