A normal woman whose father was colourblind m | vedclass

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Question

(A) Colour blindness is an $X$-linked recessive trait.$1$. The woman's father was colourblind $(X^cY)$,so she must have inherited the colourblind gene

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Daughters normal,$50\%$ of sons colourblind

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(A) Colour blindness is an $X$-linked recessive trait.$1$. The woman's father was colourblind $(X^cY)$,so she must have inherited the colourblind gene from him. Since she is normal,she is a carrier $(X^cX)$.$2$. She marries a normal man $(XY)$.$3$. The cross is $X^cX 	imes XY$.$4$. The offspring genotypes are: $X^cX$ (carrier daughter),$XX$ (normal daughter),$X^cY$ (colourblind son),and $XY$ (normal son).$5$. Thus,all daughters are phenotypically normal (though $50\%$ are carriers),and $50\%$ of the sons are colourblind.

$A$ normal woman whose father was colourblind marries a normal man. What kinds of children would be expected and in what proportion?

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