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Definition of Chromosome disorder

Chromosome disorder: An abnormal condition due to something unusual in an individual's chromosomes. For example, Down syndrome is a chromosome disorder caused by the presence of an extra copy of chromosome 21, and Turner syndrome is most often due to the presence of only a single sex chromosome: one X chromosome.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=2725
Last Editorial Review: 3/19/2012

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