XYY syndrome Flashcards
biological explanation of crime
1
Q
what is XYY syndrome?
A
- sometimes called Jacob’s syndrome
- occurs when a human male has an extra chromosome (47 chromosomes)
- occurs in 1 in 1000 male births randomly
- 75% of males with XYY go undetected
2
Q
features of XYY
A
- tall (above average height)
- increased belly fat
- a large head (macrocephaly)
- have an increased risk for learning disabilities
3
Q
Jacobs et al 1965
(supporting evidence)
A
- published work linking to XYY chromosome makeup an criminal personality
- found 7 cases (3.5%) of the XYY makeup in a study of 196 individuals in the mental hospital in Edinburgh
4
Q
Casey et al 1966
A
- published a report of research done at Moss Side and Rampton (GB) max. security hospitals
- showed that 12/50 (24%) of males tested there (choices made of males over 183cm) were of XYY or XYY variant.
