A colour blind man marries the daughter of a colour blind person. Then in their progeny which of the following conditions will be seen?

None of their daughters are colour blind.

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All the sons are colour blind.

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All the daughters are colour blind.

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Half of their sons are colour blind.

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Solution

The correct option is D Half of their sons are colour blind.
Genotype of colour blind man - Xc Y
Genotype of daughter of a colour blind man - XC Xc
The progeny produced: XC Xc (carrier female), Xc Xc (colour blind daughter), XC Y (normal male), Xc Y (colour blind male)
Thus, half of their sons will be colour blind.

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