A) Father is colourblind, mother is normal
B) Mother is colourblind, father is normal
C) Mother is carrier, father is normal
D) Mother is carrier, father is colourblind
Correct Answer: D
Solution :
For a woman to be colourblind both her X chromosomes should bear genes for the disease; which is possible only when her father is colourblind and her mother is either colourblind or a carrier of disease.
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