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An autosome is a chromosome that is not a sex chromosome – that is to say there are an equal number of copies of the chromosome in males and females.[1] For example, in humans, there are twenty-two pairs of autosomes, and, in addition, there are the X and Y sex chromosomes.

Human chromosomes

Female (XX)

Male (XY)

There are two copies of each autosome (chromosomes 1-22) in both females and males. The sex chromosomes are different: there are two copies of the X chromosome in females, but males have a single X chromosome and a Y chromosome.

See also

  • Allosome
  • Homologous chromosome
  • Sex determination
  • Roberts Syndrome



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