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(D) Genes located on the $X$-chromosome in males exhibit $X$-linked inheritance. Since males have only one $X$-chromosome $(XY)$,any recessive gene pr

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Colour blindness

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(D) Genes located on the $X$-chromosome in males exhibit $X$-linked inheritance. Since males have only one $X$-chromosome $(XY)$,any recessive gene present on this chromosome will express itself,as there is no corresponding allele on the $Y$-chromosome to mask it. Colour blindness is a well-known example of an $X$-linked recessive disorder. Baldness is typically sex-influenced,while beard and moustache growth are secondary sexual characteristics influenced by hormones. Thalassemia is an autosomal recessive blood disorder. Therefore,the correct option is $D$.

Which of the following characteristics is shown by a gene located on the $X$-chromosome in males?

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