Klinefelter's syndrome (XXY Syndrome) is genetic defect in males. This Syndrome is caused by XXY Chromosome.
Normally in males the chromosome will be XY. A person having Klinefelter's Syndrome has an extra X chromosome.
So normal male chromosome - XY.
Individual's having the above problem - XXY.
Normal female chromosome - XX.
The characteristics of Klinefelter's Syndrome caused by XXY Chromosome are :-
Subnormality,
and some other problems.
Hope you got the XXY Syndrome / Klinefelter's Syndrome (XXY Chromosome problem).
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Thank You.