Occasionally, chromosomes fail to separate during meiosis, leading to aneuploidy. It is an aberration in the number of chromosomes.
Aneuploidy can be defined as an aberration in the number of chromosomes in a given cell.
Aneuploidy occurs when chromosomes are not correctly separated during cell division (either mitosis or meiosis).
A common aneuploidy is a trisomy, where a diploid cell has three homo-logous chromosomes instead of two.
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