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trisomy
The state of a cell having 3 copies of a chromosome, instead of 2. For example, trisomy 21 or 3 copies of chromosome 21 instead of 2 as found in patients with Down's syndrome.
Related
disomy
monsomy
Specific
trisomy X; triple X syndrome
trisomy-12
trisomy-7
trisomy-8
trisomy-9
General
aneuploidy
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.