A colourblind daughter is born when: | vedclass

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(D) For a daughter to be colourblind,she must inherit the recessive gene for colourblindness from both parents. Since colourblindness is an $X$-linked

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Mother is carrier,father is colourblind

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(D) For a daughter to be colourblind,she must inherit the recessive gene for colourblindness from both parents. Since colourblindness is an $X$-linked recessive trait,the father must be colourblind $(X^cY)$ to pass the affected $X^c$ chromosome to his daughter. The mother must be either a carrier $(X^cX)$ or colourblind $(X^cX^c)$ to pass the other affected $X^c$ chromosome to the daughter. Therefore,if the mother is a carrier and the father is colourblind,there is a $50\%$ chance of producing a colourblind daughter.

$A$ colourblind daughter is born when:

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