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sex-linkageInheritance in which the gene for the condition is carried on one of the X or Y sex chromosomes. Recessive sex-linked conditions almost always affect males, are carried on the male X chromosome and thus cannot be transmitted directly from father to son. The best-known sex-linked recessive condition is haemophilia. Y-linked conditions are rare; the Y chromosome is very small and carries few genes.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005