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A normal-visioned man whose father was colour blind, marries a woman whose father was also colourblind. They have their first child as a daughter. What are the chances that this child would be colourblind?
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$0 \%$
Colour blindness is an X-linked disease. So, woman whose father was colourblind will be carrier for the disease.
So, possibility of a colourblind daughter (i.e., $X^{\mathrm{c}} \mathrm{X}^{\mathrm{c}}$ in $\mathrm{F}_1$ generation is $0 \%$.
So, possibility of a colourblind daughter (i.e., $X^{\mathrm{c}} \mathrm{X}^{\mathrm{c}}$ in $\mathrm{F}_1$ generation is $0 \%$.
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