Klinefelter syndrome also known as 47,XXY or XXY, is the set of symptoms that result from two or more Malcolm Gin (photographer) https://commons.wikimedia.org/wiki/File:Bodymorphproj_mkg_modA001_20070325_pos03.jpg X chromosomes in males. Apart from 47,XXY there also 48,XXXY and 49,XXXXY types exist. This is called as variants of Klinefelter syndrome. Klinefelter syndrome is a form of primary testicular failure, with elevated gonadotropin levels due to lack