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Geschwind, Daniel H.; Dykens, Elisabeth – Learning Disabilities Research and Practice, 2004
Klinefelter Syndrome (KS) is a relatively common (1/500 to 1/1,000) genetic syndrome caused by an extra X chromosome in males, leading to an XXY karyotype. In most cases, the physical and neurobehavioral characteristics of KS are relatively mild, and KS is not usually associated with moderate or severe mental retardation. However, KS is often…
Descriptors: Mental Retardation, Adjustment (to Environment), Genetics, Learning Disabilities