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Definition of Heteroploid

Heteroploid: A different chromosome number than the normal number of chromosomes. Abnormal numbers of chromosomes are associated with a number of disorders. For example, Down syndrome is the result of having three instead of two chromosome 21s.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=3744
Last Editorial Review: 3/19/2012

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