Biology / Bio 1189 · Atom · ~20 seconds
Aneuploidy
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Aneuploidy is a chromosome number that departs from the normal set by one or more whole chromosomes, most often from nondisjunction.
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A trisomy carries three copies of one chromosome instead of two; a monosomy carries only one.
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Aneuploidy changes chromosome count only — it is not the same event as a point mutation changing a single gene's sequence.