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What is a Karyotype?
Shown above is a human karyotype, a photograph of the full set of a person's chromosomes as viewed under a microscope. Karyotypes are prepared by specially treating cells so that the chromosomes within the cell can easily be viewed under a microscope. Chromosomes are then photographed, arranged, and numbered so that any alterations or extra copies can be identified.
The individual above has an extra copy of chromosome 21, indicating Down syndrome. Typically, individuals have two copies of each chromosome.
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