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X chromosome

noun

Definitions

Noun
  1. 1
    A mammalian sex chromosome: in the XY sex-determination system, cells of females typically have a pair of X chromosomes, while cells of males typically have an X and a Y.
  2. 2
    the sex chromosome that is present in both sexes: singly in males and doubly in females wordnet

Etymology

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 and Y chromosomes to the letters "X" and "Y" respectively during cell division is entirely coincidental.

See also for "x chromosome"

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