The gene for colour blindness is located on

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(B) The gene responsible for red-green colour blindness is located on the non-homologous region of the $X$-chromosome.Because this gene is recessive a

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Non-homologous part of $X$-chromosome

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(B) The gene responsible for red-green colour blindness is located on the non-homologous region of the $X$-chromosome.Because this gene is recessive and located on the $X$-chromosome,it is classified as an $X$-linked recessive trait.Since males have only one $X$-chromosome $(XY)$,they are more frequently affected than females,who have two $X$-chromosomes $(XX)$ and would require both to carry the recessive allele to express the phenotype.

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