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One of the two X chromosomes of a woman has one allele for haemophilia and one allele for colourblindness. Her other X chromosome has normal alleles. She marries a normal man. Which of the following is most likely about their offspring?

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Half of the sons and half of the daughters are colourblind.

Half of the sons are haemophilic and half of the daughters are colourblind.

Half of their sons and daughters suffer from colourblindness as well as haemophilia.

Half of their sons suffer from haemophilia as well as colourblindness.

answer is D.

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Detailed Solution

Mother - XX^ch Father - XY

Sons - XY (Normal), X^chY (Both colourblind and haemophilic)

Daughters - XX (Normal), X^chX (Carrier for colourblindness and haemophilia)

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