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(B) Colour blindness is an $X$-linked recessive disorder.Let the genotype of a normal-visioned man be $XY$ and a colourblind woman be $X^c X^c$.When t

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Colourblind sons and carrier daughters

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(B) Colour blindness is an $X$-linked recessive disorder.Let the genotype of a normal-visioned man be $XY$ and a colourblind woman be $X^c X^c$.When these two individuals mate,the cross is as follows:$P: X^c X^c$ (colourblind woman) $	imes XY$ (normal man)Gametes: $X^c$ and $X^c$ from the mother; $X$ and $Y$ from the father.$F_1$ generation:- $X^c X$: Carrier daughter- $X^c Y$: Colourblind sonThus,all sons will be colourblind and all daughters will be carriers.

$A$ marriage between a normal-visioned man and a colourblind woman will produce which of the following types of offspring?

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$A$ man whose father was colorblind marries a woman who has a colorblind mother and a normal father. What is the percentage probability of their male children being colorblind (in $\%$)?

$A$ normal-visioned man whose father was colourblind marries a normal woman whose father was also colourblind. They have one son. What is the probability of the son being colourblind (in $\%$)?

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