Down's syndrome is an example of

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(A) Aneuploidy is a condition characterized by an abnormal number of chromosomes in a cell,resulting from the gain or loss of one or more chromosomes

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Aneuploidy

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(A) Aneuploidy is a condition characterized by an abnormal number of chromosomes in a cell,resulting from the gain or loss of one or more chromosomes during cell division.Down's syndrome is a specific chromosomal disorder caused by the presence of an extra copy of chromosome $21$,a condition known as trisomy $21$.Since this involves the addition of a single chromosome to the diploid set,it is classified as a type of aneuploidy.

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