Klinefelter syndrome

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This is Klinefelter's syndrome with a 47, XXY karyotype. A non-dysjunctional event in meiosis (maternal or paternal) left two X chromosomes in an ovum or a sperm. This is relatively common (about 1 in 500 males). Affected males are usually normal, though they may be tall and have small testes. Infertility results from absent sperm. About half have gynecomastia. About 10% of cases are mosaics and are less affected

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