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(C) Sex-linked traits are genes located on the sex chromosomes. In humans,the majority of sex-linked genes are located on the $X$-chromosome because i

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$X$-chromosome

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(C) Sex-linked traits are genes located on the sex chromosomes. In humans,the majority of sex-linked genes are located on the $X$-chromosome because it is much larger and contains more genes than the $Y$-chromosome. Since males have only one $X$-chromosome (hemizygous),any recessive allele present on their $X$-chromosome will express its phenotype,as there is no corresponding allele on the $Y$-chromosome to mask it.

In humans,sex-linked characters are mainly transmitted through:

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