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Why does trisomy and monosomy occur? And why are they so bad on the molecular level?
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Why does trisomy and monosomy occur? And why are they so bad on the molecular level?

User Viz
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Monosomy (the lack of one member of a chromosome pair) and trisomy (a triplet instead of the normal chromosome pair) are typically the result of nondisjunction during meiosis.
User Justin Rassier
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