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(C) Colour blindness is an $X$-linked recessive disorder.Let $X^c$ represent the allele for colour blindness and $X$ represent the normal allele.$A$ c

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(C) Colour blindness is an $X$-linked recessive disorder.Let $X^c$ represent the allele for colour blindness and $X$ represent the normal allele.$A$ colour blind female has the genotype $X^c X^c$.$A$ man whose mother was colour blind must have inherited the $X^c$ allele from her,so his genotype is $X^c Y$.When they marry $(X^c X^c 	imes X^c Y)$:- Offspring genotypes: $X^c X^c$ (colour blind daughter),$X^c Y$ (colour blind son),$X^c X^c$ (colour blind daughter),$X^c Y$ (colour blind son).All offspring $(100 \%)$ will be colour blind.

If a colour blind female marries a man whose mother was also colour blind,what are the chances of her progeny having colour blindness (in $\%$)?

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