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An autosome is a non-sex chromosome. It is an ordinarily paired[1] type of chromosome that is the same in both sexes of a species. For example, in humans, there are 22 pairs of autosomes.

The X and Y chromosomes are not autosomal. Non-autosomal chromosomes are usually referred to as sex chromosomes, allosomes or heterosomes.



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  1. In the case of higher ploidy levels than the usual diploid, there will be the same number of an autosome as the ploidy level itself. For example, in a pentaploid, there will be five copies of each autosome.


<1-- de:Autosom et:Autosoom es:Autosómico fr:Chromosome homologue he:אוטוזומי hu:Autoszóma nl:Autosoomsr:Аутозом sv:Autosom --->

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