Question

Which of the following is not an example of aneuploidy?

• A. Turner’s syndrome
• B. Down’s syndrome
• C. Phenylketonuria
• D. Klinefelter’s syndrome

Hint:

Phenylketonuria is a genetic disorder, not a chromosomal abnormality.

Answer 1

The Correct Option is C

Aneuploidy refers to the presence of an abnormal number of chromosomes. Turner’s, Down’s, and Klinefelter’s syndromes are caused by chromosomal number abnormalities. Phenylketonuria, however, is a metabolic disorder caused by a mutation in a single gene and not by aneuploidy.