A colourblind boy has a colourblind sister and normal brother, then the parents are
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a
Normal father and carrier mother
b
Carrier mother and colourblind father
c
Normal father and colourblind mother
d
Both mother and father are colourblind
answer is B.
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Detailed Solution
Boys inherit gene for colorblindness from mother only. Colourblind sister inherited gene from both mother and fatherColour blind son (XCY), Colour blind daughter (XCXC), Normal son (XY)Mother (XCX) - CarrierFather (XCY) - Colour blind