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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a
Half of the sons and half of the daughters are colourblind.
b
Half of the sons are haemophilic and half of the daughters are colourblind.
c
Half of their sons and daughters suffer from colourblindness as well as haemophilia.
d
Half of their sons suffer from haemophilia as well as colourblindness.
answer is D.
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Detailed Solution
Mother - XXch Father - XYSons - XY (Normal), XchY (Both colourblind and haemophilic)Daughters - XX (Normal), XchX (Carrier for colourblindness and haemophilia)
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?