Other Interesting Facts

• No females can be born with XYY Syndrome, only male
• XYY Syndrome males are usually sterile
• XYY Syndrome (47,XYY) is often compared to 47,XXX Syndrome, 45,X, and 47,XXY Syndrome. Perhaps there is some relation. Maybe it's paranormal???

 

• The earliest known case of XYY Syndrome was in the 1960's was Avery Sandburg
• In 1974, a psychologist named John Money experimented with 13 XYY boys by giving them a high dosage of Depo-Provera, resulting in weight gain and suicide