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Question

Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is?

A
0%
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B
25%
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C
50%
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D
75%
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Solution

The correct option is A 0%
If both husband and wife have normal vision when their fathers are colorblind then, the husband has normal vision while the wife is a carrier of the colorblind gene, that is located on the X chromosome. This would result in one normal and one carrier female progeny, both being phenotypically normal.
So, the correct answer is'0%'

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