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Sex Linkage

X. X. X. X. Y. X. Y. X. Carrier mother. Unaffected father. Unaffected son. Unaffected daughter. Affected son. Carrier daughter. X. Y. X. X. Sex Linkage. Sex-linked traits show a distinct pattern of inheritance.

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Sex Linkage

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  1. X X X X Y X Y X Carrier mother Unaffected father Unaffected son Unaffected daughter Affected son Carrier daughter X Y X X Sex Linkage • Sex-linked traits show a distinct pattern of inheritance. • Fathers pass sex-linked alleles to all their daughters but not to their sons. • Mothers can pass sex-linked alleles to both sons and daughters. • In females, sex-linked recessive traits will be expressed only in the homozygous condition. • In contrast, any male receiving the recessiveallele from his mother will express the trait.

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