Name: Betty A Laliberte
Advanced Placement Biology students are looking for information on XXX
chromosome abnormalities and Xyy chromosome abnormalities. Looking for prevalence,
causes, treatment, prognosis. Can anyone give us information?
XYY karyotype individuals are phenotypically normal fertile males. The
term syndrome isn't even used (hence "karyotype") because the symptoms are usually
mild: tallness and acne. There was a belief that XYY individuals had certain
criminal tendencies, but there has been NO evidence for this.
Click here to return to the Biology Archives
Update: June 2012