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Presence of an excess or dearth of one or a few chromosomes in a eukaryotic cell.
Aneuploids are a consequence of nondisjunctions. One too few chromosomes is a monosomy while one too many is an trisomy.
Human aneuploidies, particularly that tend to survive to adulthood, include Turner syndrome (monosomy X), Down syndrome (trisomy 21), and Klinefelter syndrome (XXY). Human aneuploidies that present no or few abnormalities include trisomy X (i.e., XXX) and XYY.
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