XYY syndrome

Also known as: 47,XYY; Jacobs syndrome

Males with an extra Y chromosome, often mild.

Medical specialty: Genetics
Subspecialty: Genetics / Chromosomal disorders
Sex & age distribution: Male: affected; Female: not affected; Children: yes
Gene(s) involved: None recorded

Etiology & mechanism

Extra Y chromosome.

Gene(s) involved (0)

No gene recorded.

Symptoms & signs (5)

behavioral problemslearning difficultiesmacrocephalyspeech delaytall stature

SyndromeScope — educational reference. Content is model-generated and not clinically verified; always confirm against OMIM, Orphanet and GeneReviews before clinical use.