A normal-visioned man whose father was colour | vedclass

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(B) Colour blindness is an $X$-linked recessive trait. Let $X^C$ be the allele for colour blindness and $X$ be the normal allele.$1$. The man is norma

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(B) Colour blindness is an $X$-linked recessive trait. Let $X^C$ be the allele for colour blindness and $X$ be the normal allele.$1$. The man is normal-visioned,so his genotype is $XY$. His father was colour-blind,but this does not affect the man's genotype as he inherits his $Y$ chromosome from his father.$2$. The woman's father was colour-blind,meaning she must be a carrier of the trait. Her genotype is $XX^C$.$3$. The cross between the man $(XY)$ and the carrier woman $(XX^C)$ is: $XY 	imes XX^C$.$4$. The possible genotypes of the offspring are: $XX$ (normal daughter),$XX^C$ (carrier daughter),$XY$ (normal son),and $X^CY$ (colour-blind son).$5$. The probability of having a colour-blind daughter is $0$ because a daughter needs to inherit the $X^C$ allele from both parents to be colour-blind,but the father is normal $(XY)$.

$A$ normal-visioned man whose father was colour-blind,marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?

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