Autosome

1. An autosome is any chromosome that is not a sex chromosome (an allosome). Members of an autosomal pair in a diploid cell have the same morphology, unlike those in pairs of allosomes that may have different structures. DNA in autosomes is collectively known as atDNA or auDNA.
2. Any chromosome other than the X and Y sex chromosomes. People normally have22 pairs of autosomes (44 autosomes) in each cell.
3. An autosome is any of the numbered chromosomes, as opposed to the sex chromosomes. Humans have 22 pairs of autosomes and one pair of sex chromosomes (the X and Y). Autosomes are numbered roughly in relation to their sizes. That is, Chromosome 1 has approximately 2,800 genes, while chromosome 22 has approximately 750 genes.
4. An autosome is any chromosome other than a sex chromosome. Humans have 23 pairs of chromosomes altogether, 22 of which are pairs of autosomes. Each parent contributes one member to each pair of autosomes.

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