Colour blindness is a disease usually affecti | vedclass

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(A) Colour blindness is an $X$-linked recessive disorder.In this condition,the gene responsible for the trait is located on the $X$ chromosome.Since m

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$X$ chromosome

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(A) Colour blindness is an $X$-linked recessive disorder.In this condition,the gene responsible for the trait is located on the $X$ chromosome.Since males have only one $X$ chromosome $(XY)$,they express the trait if they inherit the affected chromosome from their mother.Females have two $X$ chromosomes $(XX)$,so they can be carriers without showing the disease if they have one normal and one affected allele.Because the gene is on the $X$ chromosome,a mother can pass the trait to her sons (who receive her $X$ chromosome) and daughters (who may become carriers),making the woman the transmitter of the factor.

Colour blindness is a disease usually affecting men,but the factor for it is transmitted to the children always by the woman. This is because the particular factor is located on

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