X-Linked Inheritance
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An X-linked trait's gene sits on the X chromosome, so a male, with only one X, expresses whatever allele that single X carries.
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A Drosophila male with one X-linked white-eye allele shows the trait, with no second allele to mask it.
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A male's single X leaves him hemizygous at every X-linked locus — dominance applies differently there than at an autosomal locus.