The genetic disorder due to the presence of an extra copy of chromosome 21 is:

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Down syndrome (trisomy 21) is an autosomal aneuploidy caused by nondisjunction resulting in three copies of chromosome 21. It is characterized by intellectual disability, flat facial profile, protruding tongue, and simian crease. Turner's syndrome is monosomy X (45, X). Klinefelter's is 47, XXY. Phenylketonuria is an inborn error of metabolism (autosomal recessive) due to deficiency of phenylalanine hydroxylase.

The genetic disorder due to the presence of an extra copy of chromosome 21 is: MCQ with Answer and Explanation

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