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A colour blind girl is rare because she will be born only when

1. her mother and maternal grand father were colour blind
2. her father and maternal grand father were colour blind
3. her mother is colour blind and father has normal vision
4. parents have normal vision but grand parents were colour blind

Correct answer: her father and maternal grand father were colour blind

Solution

Colour blindness is usually X-linked recessive. A daughter must receive a colour-blind X from her father and another affected X from her mother; the maternal grandfather can supply that X to the mother, making the rare combination possible.

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