A girl of normal vision whose father was colo | vedclass

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(B) The girl has normal vision but her father was colourblind,so she must be a carrier $(X^CX)$.The man has normal vision,so his genotype is $(XY)$.Wh

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$50\%$ colourblind

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(B) The girl has normal vision but her father was colourblind,so she must be a carrier $(X^CX)$.The man has normal vision,so his genotype is $(XY)$.When they marry,the cross is: $X^CX 	imes XY$.The possible genotypes for their children are: $XX$ (normal daughter),$X^CX$ (carrier daughter),$XY$ (normal son),and $X^CY$ (colourblind son).Among the sons,$50\%$ will be normal $(XY)$ and $50\%$ will be colourblind $(X^CY)$.

$A$ girl of normal vision whose father was colourblind marries a man of normal vision whose father was also colourblind. What percentage of their sons would be colourblind?

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