Klinefelter Syndrome
(also: Klinefelter's Syndrome, Trisomy XXY, XXY Syndrome)
Table of Contents
General Information
Someone with Klinefelter Syndrome develops an extra copy of the X chromosome, resulting in a 47XXY pattern (as opposed to the typical 46XY). These individuals may have smaller-than-typical testes that produce lower amounts of testosterone and/or sperm. They may start puberty later than typical, or be unable to go through puberty without hormone therapy. They may develop breast tissue, may grow tall, and often experience infertility. This intersex variation often does not cause obvious physical differences, resulting in many people not realizing that they have it.
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