XXX Females
Print Friendly, PDF & Email

almostadoctor app banner for android and iOS almostadoctor iPhone, iPad and android apps almostadoctor iOS app almostadoctor android app
Approximately 0.1% of females have an extra X chromosome. It is likely that there will be no clinical features, however, some studies suggest that:
  • intelligence is typically reduced by 10-20 IQ points. Special educational requirements are rare
  • they may show aggressive / unsociable behaviour
 95% of cases are due to problems in maternal meiosis. Most patients are fertile, and will not usuallypass on the defect
Extra X chromosomes
Further X chromosomes (e.g. XXXX, XXXXX) are associated with a reduced intellectual capacity proportional to the number of X chromosomes present.
The same is true for males with extra X chromosomes, such as XXY, XXXY.

Related Articles

Dr Tom Leach

Dr Tom Leach MBChB DCH EMCert(ACEM) FRACGP currently works as a GP and an Emergency Department CMO in Australia. He is also a Clinical Associate Lecturer at the Australian National University. After graduating from his medical degree at the University of Manchester in 2011, Tom completed his Foundation Training at Bolton Royal Hospital, before moving to Australia in 2013. He started almostadoctor whilst a third year medical student in 2009. Read full bio

Leave a Reply