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A male who has normal vision marries a woman who is colorblind. What percentage of  their male offspring will be colorblind?Group of answer choices

Question

A male who has normal vision marries a woman who is colorblind. What percentage of  their male offspring will be colorblind?Group of answer choices

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Solution

Colorblindness is a sex-linked trait that is carried on the X chromosome. Men only have one X chromosome, which they receive from their mother. Women have two X chromosomes, one from each parent.

In this case, the man has normal vision, so his X chromosome does not carry the colorblindness trait. The woman is colorblind, so both of her X chromosomes carry the trait.

When they have a child, the child will receive one X chromosome from the mother and either an X or a Y from the father (determining the child's sex).

If the child is male (XY), he will receive the Y chromosome from his father and the X chromosome from his mother. Since the mother is colorblind, the X chromosome she passes on will carry the colorblindness trait. Therefore, 100% of their male offspring will be colorblind.

If the child is female (XX), she will receive one X chromosome from each parent. Since the father's X chromosome does not carry the colorblindness trait, the female child will be a carrier of the trait but will not be colorblind herself.

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