Autosomal is a term derived from English autosome. It is formed with the prefix car- (referring to "by oneself" or to "own self") and the ending of the word chromosome (namely, "chromosome": a condensed strand of DNA that can be seen in the cell nucleus during mitosis and that they have a constant number in each species).


An autosome is a chromosome what has no role in determining the sex of the individual. It is, therefore, a nonsex chromosome.

The human being has twenty-two pairs of autosomes and only one pair of sex chromosomes. This pair of sex chromosomes, which is the twenty-third pair, is the one that precisely defines sex: in the man count with one X chromosome and a Y chromosome, while in the woman presents two X chromosomes.

The numbering of the autosomes develops according to their size, reflected in the amount of genes, in reverse. In other words, the largest autosomes are the ones with the lowest number and vice versa.

The pair number one chromosome (the first of the autosomes) houses about 3,000 genes. The pair number twenty two (the latter in the case of autosomes), meanwhile, it has about 750 genes.

Each personIn short, it has twenty-two pairs of autosomes, which are numbered from one to twenty-two. It also has a remaining pair of chromosomes (the pair twenty three), made up of the sex chromosomes (X or Y). It is important to mention that autosomes and sex chromosomes differ in their performance, size, and appearance.

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