What is (are) 47, XYY syndrome ?
47, XYY syndrome is a condition in males characterized by features that occur due to having an extra copy of the Y chromosome in each cell. Signs and symptoms can vary and range from barely noticeable to more severe; many men with the extra Y chromosome are completely unaware of its presence. Appearance and intelligence are usually normal, but learning disabilities may be present. Other signs and symptoms may include autism spectrum disorder (usually on the milder end); speech or motor delay; low muscle tone; asthma; tall stature; impaired social skills; ADHD; and/or anxiety or mood disorders. While sexual development and infertility is usually normal, some adolescents and adults have testicular failure. 47, XYY syndrome usually is not inherited, occurring due to a random event in the formation of a sperm cell prior to conception. Management depends on the symptoms in each person and may include intervention or therapies for developmental delays, behavior or mood disorders; and/or special education.