Hi XYY Syndrome is also sometimes called Jacob’s Syndrome, XYY Karyotype, or YY Syndrome. Males with XYY Syndrome live typical lives for the most part. Some males with XYY Syndrome may be taller than average and face learning difficulties or speech problems. They may also grow up with minor physical differences, such as weaker muscles and bones and delayed puberty. When they are older, men with the syndrome may face fertility issues and complications related to low testosterone levels. Besides these complications, however, males with XYY syndrome do not usually have any distinguishing physical features or complications, and have normal sexual development. In case of any further information on this, do call back.