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KLINEFELTER SYNDROME THE XXY BOY IN THE CLASSROOM Although there are exceptions, XXY boys are usually well behaved in the classroom. Most are shy, quiet, and eager to please the teacher. But when faced with material they find difficult, they tend to withdraw into quiet daydreaming. Teachers sometimes fail to realize they have a language problem, and dismiss them as lazy, saying they could do the work if they would only try. Many become so …

…cells with the normal XY chromosome count. If the number of XY cells in the testes is great enough, the individual should be able to father children. Karyotyping, the method traditionally used to identify an individual's chromosome count, may sometimes fail to identify XY/ XXY mosaics. For this reason, a karyotype should never be used to predict whether an individual will be infertile or not. Resources http://www.nih.gov/health/chip/nichd/klinefelter/#xwhat