![]() ![]() Chromosomes are tiny, but they play a huge role in who we are - including deciding our gender, how we look, and how we grow.ĭoctors sometimes call Klinefelter syndrome "XXY." Instead of one X and one Y chromosome like most guys have, guys with Klinefelter syndrome are born with an extra "X" chromosome in most or all of their cells. It happens because of a difference deep inside the body's cells, in microscopic strings of DNA (what make up genes) called chromosomes. It's a genetic condition (meaning a person is born with it). Klinefelter syndrome can cause problems with learning and sexual development in guys.
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