Dictionary of Human Evolution and Biology

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X Chromosome

One of two sex chromosomes in mammals, the segregational homologue of the Y chromosome; occurs singly in the heterogametic sex (males) and as a pair in the homogametic sex (females), and is associated with sex determination. The X chromosome has been highly conservative in mammalian chromosome evolution; that is, whereas many other chromosomes have undergone multiple inversions and translocation exchanges with other chromosomes, the X chromosome has remained morphologically stable across many species.

Cf. Y chromosome and autosome.

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