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Question

A normal woman, whose father was colour blind is married to a normal man. Her sons would be

A
All normal
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B
All colour blind
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C
75% colour blind
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D
50% colour blind
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Solution

The correct option is D 50% colour blind
Genotype of mother - XC Xc
Genotype of father - XC Y
Offsprings: XC XC (Normal), XC Y (Normal), Xc XC (Normal), Xc Y (Colour blind).

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