| A karyotype, like the ones shown here, is a photographic image that depicts all of the chromosomes in an individual cell. Laboratory workers use computers to rearrange the images so that the chromosomes are lined up in pairs, typically beginning with the autosomes—chromosomes 1 through 22—and ending with the sex chromosomes—normally XX or XY. A complete karyotype helps doctors determine if a person has extra chromosomes, missing chromosomes, or chromosomes that have attached to one another in unusual ways. |
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