A colour blind man marries a female with homo | vedclass

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(A) Colour blindness is a sex-linked recessive trait.Let $X^c$ be the recessive gene for colour blindness and $X$ be the normal gene.Genotype of the m

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(A) Colour blindness is a sex-linked recessive trait.Let $X^c$ be the recessive gene for colour blindness and $X$ be the normal gene.Genotype of the man: $X^cY$.Genotype of the woman (homozygous normal): $XX$.Cross: $X^cY 	imes XX$.Offspring genotypes: $X^cX$ (carrier daughter), $X^cX$ (carrier daughter), $XY$ (normal son), $XY$ (normal son).Since all sons receive their $X$ chromosome from the mother, who is homozygous normal, all male children will have normal vision.Therefore, the possibility of colour blindness in their male children is $0$.

$A$ colour blind man marries a female with homozygous normal vision. What will be the possibility of colour blindness in their male children?

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