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In humans, color-blindness (Xn) is sex-linked and recessive to normal vision (XN).  A color-blind man has several...

In humans, color-blindness (Xn) is sex-linked and recessive to normal vision (XN).  A color-blind man has several children with a woman who does not carry a gene for color-blindness.

a. What proportion of this couple’s children could be color-blind?

b. What proportion of their daughters could be carriers of the gene?  What proportion of their sons?

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