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Definition of Aneuploidy

Aneuploidy: A condition in which a person has one or a few chromosomes above or below the normal chromosome number. For example, three copies of chromosome21, which is characteristic of Down syndrome, is a form of aneuploidy.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=2249
Last Editorial Review: 3/19/2012

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