If a mother is a carrier for colour blindness | vedclass

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(C) Colour blindness is an $X$-linked recessive disorder. Let $X^C$ be the normal allele and $X^c$ be the colour-blind allele.Mother is a carrier: $X^

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$50\%$ of sons and $50\%$ of daughters (carrier)

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(C) Colour blindness is an $X$-linked recessive disorder. Let $X^C$ be the normal allele and $X^c$ be the colour-blind allele.Mother is a carrier: $X^C X^c$.Father is normal: $X^C Y$.Crossing: $X^C X^c 	imes X^C Y ightarrow X^C X^C$ (Normal daughter),$X^C Y$ (Normal son),$X^C X^c$ (Carrier daughter),$X^c Y$ (Colour-blind son).Thus,$50\%$ of the sons will be colour-blind and $50\%$ of the daughters will be carriers.

If a mother is a carrier for colour blindness and the father is normal,then in the offspring,this disease may be seen in:

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