Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mammalian sex chromosome. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.

Etymologies

Named by Hermann Henking in 1890 from x (signifying the unknown) due to some baffling properties he had observed. The brief resemblance in the appearance of the X chromosome to the letter "X" during cell division is entirely coincidental. (Wiktionary)

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