Took blood samples from 30K+ men. 12 had XYY and they found that they had slightly lower than average intelligence and were more aggressive. More similarities than differences for XXY and XYY = limited evidence for XYY as opposed to XXY being aggro
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XYY STRENGTH- Jacob et al (1965)
Suggested that men with XYY = more aggressive and there was an over-representation of XYY in prisons. Suggested = 15 XYY men for every 1000 prisoners. Also thought to make men overtly aggressive and lack empathy
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XYY limited STRENGTH- Stochholm et al (2012)
Studied 161 XYY men and 934 XXY men aged 15-70. When controlled on background variables, differences between XXY/XYY men were very limited. However, they still showed an increase in some areas like sexual abuse and arson
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XYY WEAKNESS- Witkin et al (1976)
5491 Danish men and found only 12 cases of XYY. Also, there was no difference between XYY and XXY in terms of significance.
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XYY WEAKNESS- Re & Birkhoff (2015)
Carried out a review of XYY over the last 50 years and found no link. Aggression, impulse control, and low tolerance of frustration an also be linked with environmental factors.
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XYY WEAKNESS of Nature-Nurture
Difficulty in separating the two- someone may genetically have XYY, but any effect from genetic differences can be down to environmental influences
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Other cards in this set
Card 2
Front
Suggested that men with XYY = more aggressive and there was an over-representation of XYY in prisons. Suggested = 15 XYY men for every 1000 prisoners. Also thought to make men overtly aggressive and lack empathy
Back
XYY STRENGTH- Jacob et al (1965)
Card 3
Front
Studied 161 XYY men and 934 XXY men aged 15-70. When controlled on background variables, differences between XXY/XYY men were very limited. However, they still showed an increase in some areas like sexual abuse and arson
Back
Card 4
Front
5491 Danish men and found only 12 cases of XYY. Also, there was no difference between XYY and XXY in terms of significance.
Back
Card 5
Front
Carried out a review of XYY over the last 50 years and found no link. Aggression, impulse control, and low tolerance of frustration an also be linked with environmental factors.
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