The gene for colour blindness is carried by:

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(B) Colour blindness is a sex-linked recessive disorder caused by a defective gene located on the $X$-chromosome.Since females have two $X$-chromosome

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$II$ and $III$

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(B) Colour blindness is a sex-linked recessive disorder caused by a defective gene located on the $X$-chromosome.Since females have two $X$-chromosomes $(XX)$ and males have one $X$-chromosome $(XY)$,the inheritance pattern depends on the parents.$A$ colour-blind male inherits the defective gene from his mother,while a colour-blind female inherits the defective gene from both her father and her mother.Therefore,the gene for colour blindness is carried by both the father and the mother.

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