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Q.

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
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A colourblind boy has a colourblind sister and normal brother, then the parents are