Chromosomal makeup There have been studies looking into the possibility that an abnormality with one's chromosomes could be the trigger for serial killers. Two serial killers, Bobby Joe Long and Richard Speck, came to attention for reported chromosomal abnormalities. Long had an extra X chromosome. Speck was erroneously reported to have an extra Y chromosome; in fact, his karyotype was performed twice and was normal each time. While attempts have been made to link the XYY karyotype to violence, including serial murder, research has consistently found little or no association between violent criminal behaviour and an extra Y chromosome.
Chromosomal makeup There have been studies looking into the possibility that an abnormality with one's chromosomes could be the trigger for serial killers Two serial killers Bobby Joe Long and Richard Speck came to attention for reported chromosomal abnorma!lities Long had an extra X chromosome Speck was erroneously reported to have an extra Y chromosome; in fact his karyotype was performed twice and was normal each time While attempts have been made to link the XYY karyotype to violence including serial murder research has consistently found little or no assoc:iation between violent criminal behaviour and an extra Y chromosome