This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Double Y syndrome

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

This is an example of sex chromosome anomaly.

The genotype of affected individuals is 47, XYY.

There is an incidence of about 1 in 800 male births.

Clinical features of individuals with this genotype include:

  • males are tall, fertile
  • it was hypothesised that males with this genotype had minor mental and psychiatric illness, and that there was a higher than average incidence of this genotype in tall criminals. These hypotheses are now being disputed

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.


Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.