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Colour blindness is a X chromosome linked character. So they’ll be having all colour blind sons and carrier daughters.

1. XY × XXC
2. Carrier daughter
3. XY
4. Carrier

Correct answer: XY × XXC

Solution

For an X-linked trait, a male passes his X chromosome only to daughters and his Y chromosome only to sons. If the father is colour blind and the mother is a carrier, all sons can be colour blind if they receive the affected X from the mother, while daughters receive the father's affected X and become carriers if they also get a normal X from the mother.

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