The most common sex chromosome syndrome; characterized by the presence of an extra X chromosome in males, resulting in a classic presentation including gynecomastia, small testes, infertility, and minimal body and facial hair.
The contents of this glossary is funded in part through a sub-award from RTI as the lead partner for the National Institute of Justice’s Forensic Technology Center of Excellence through a Cooperative Agreement from the National Institute of Justice (2011-DN-BX-K564 and 2016-MU-BK-K110), Office of Justice Programs, U.S. Department of Justice. Neither the U.S. Department of Justice nor any of its components operate, control, are responsible for, or necessarily endorse, this website (including, without limitation, its content, technical infrastructure, and policies and any services or tools provided).
