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Question

A sex linked recessive gene 'C' produces red green colour blindness in humans. A normal woman whose father was colourblind marries a colourblind man. Of all the girls born to these parents, what percentage is expected to be colour blind?


A
25 percent
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B
50 percent
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C
75 percent
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D
100 percent
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Solution

The correct option is B 50 percent
A sex linked recessive gene 'C' produces red - green colour blindness in humans. A normal woman whose father was colourblind - XC Xc, marries a colourblind man - Xc Y. Offsprings: XC Xc, Xc Xc (carrier), XC Y and Xc Y (colour blind).
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Biology

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