Biology / Unit 6 Bio 1189 short lesson, about 20 seconds
Aneuploidy
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The idea
Aneuploidy is a chromosome number that departs from the normal set by one or more whole chromosomes, most often from nondisjunction.
In practice
A trisomy carries three copies of one chromosome instead of two; a monosomy carries only one.
Where people slip
Aneuploidy changes chromosome count only — it is not the same event as a point mutation changing a single gene's sequence.
Your place on the trail
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