In humans color vision is X-linked, the gene for color vision is located on the X chromosome but is absent on the Y chromosome. Normal color vision (XN) is dominant over colorblindness (Xn). Suppose a colorblind man fathers the children of a woman with genotype XNXN.  What is the genotype of the father?  What proportion of daughters will be colorblind?  What proportion of the sons will be colorblind?

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Communication

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