How many autosomes does a human have

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Related Articles No related articles found See all Related Topics. We actually have a total of 23 pairs of chromosomes in these cells, for a total of 46 chromosomes, but two of those are referred to by letter rather than by number and are called sex chromosomes rather than autosomes, since they--that is the X and Y chromosome--help determine what sex, or gender, we are. The 22 pairs of autosomes are referred to by number basically in inverse correlation with their size.

That is, Chromosome 1, with the smallest number, is actually the largest chromosome. It has almost 3, genes on it. And we go down to the smallest chromosomes, the ones with the largest numbers. You think that would be Chromosome 22, since we have Chromosomes 1 through 22, which only has about genes, but in fact Chromosome number 22 is not the smallest of the autosomes.