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AC2.1
genetic theories
XYY theory
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The XYY Theory
A genetic condition in which a male has an
extra
Y
chromosome, giving a total of
47
chromosomes
this condition of the XYY theory occurs in about
1
in
1000
male births
XYY condition
The presence of an
extra
Y
chromosome
can
cause
criminal behavior
Jacob (1965): 'Some XYY men have an increase in
aggression
compared to XY men, and have been labelled as "
super males
"'
XYY syndrome
Serial killer
John Wayne Gacy
was suggested to have the
XYY
syndrome
Some criminologists have suggested that
Gacy
was "
born to kill
"
Sex chromosomes
Females have
XX
, males have XY. The Y chromosome determines
maleness.
XYY theory involves an extra
Y
chromosome,
giving
XYY