Karyotypic abnormality in which a specific chromosome(s) is present in too many or too few copies is known as...

Options :
  1. Polyploidy
  2. Haploidy
  3. Aneuploidy
  4. Diploidy
Answer and Explanation :-

Answer: Option 3

Explanation:

Aneuploidy is an abnormal number of chromosomes, and is a type of chromosome abnormality. An extra or missing chromosome is a common cause of genetic disorders (birth defects). Aneuploidy occurs during cell division when the chromosomes do not separate properly between the two cells.

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