XXY

A term for the chromosomal pattern that causes a condition called Klinefelter syndrome, an intersex condition in which a person assigned male at birth has an extra X chromosome. This can cause a number of common symptoms, including: - Taller bodies, prone to less muscle - Broader hips and reduced upper body strength - Gynecomastia (development of breast tissue on an AMAB body) - Smaller genitals - High infertility rate Frequently, the symptoms can be treated with hormone therapy (testosterone), though this will not reverse every physical change, particularly if done post-puberty (when most are diagnosed).