What are all the chances of colourblind daughters and sons being born in a marriage of a normal man with a normal woman whose father was colourblind?

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All sons are normal and daughters are colourblind

Both the sons and daughters are phenotypically normal

Both the sons and daughters are colourblind

50% of sons are colourblind and all daughters are phenotypically normal

answer is D.

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Detailed Solution

As the woman's father is colourblind, she is a carrier for the disease. The children of the woman could be either normal, carriers or colourblind if she marriers a man who is normal. Hence, 50% of sons could be colourblind and all the daughters are phenotypically normal. Father of the woman- colourblind – XCY Woman - carrier for colour blindness – XXC Man - normal – XY Children of the woman - XX, XY, XXC, XCY.

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