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Klinefelter's syndrome a congenital disorder that causes sterility in males, caused by an extra X chromosome.
sex-linkage in genetics, an association between certain inherited traits and sex, the genes for those traits being carried on one of the sex chromosomes.
X chromosome the sex chromosome that occurs paired in females and singly in males, and is responsible for female sex characteristics. (Cf. Y chromosome.)
Y chromosome a sex chromosome that occurs only in males, paired with an X chromosome, and is responsible for male sex characteristics. (Cf. X chromosome.)