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Klinefelter’s syndrome is a chromosomal disorder characterised by the presence of an extra X chromosome in 
a human male, resulting in a karyotype of 47, XXY.

Persons exhibiting Klinefelter’s syndrome have reduced fertility. They are taller and exhibit gynecomastia.

(1) Phenylketonuria is an autosomal disorder.

(2) Down’s syndrome is due to trisomy (2n+1), a form of aneuploidy. It is not a case of triploidy (3n).

(3) Turner’s syndrome is due to monosomy (2n-1).