genetic explanation for aggression

Question 1

AO2 - Twin studies
Cocarro

Answer 1

need to establish causal link between A and predispositions to A behaviours.
adult twin pairs – 50% variance in direct aggression = genetic

Question 2

A02 - Adoption studies
Hutchings and Mednick

Answer 2

positive link in bio parents = genetic – adoptive = situational. ​
14,000 Danish adoptions – those with criminal fathers = more likely to be criminals.

Question 3

MAOA Gene

Answer 3

codes for NT controlling enzyme – metabolises S-NT

Question 4

MAOA-L

Answer 4

increases serotonin attributed to aggression

Question 5

MAOA-H

Answer 5

decreases serotonin
attributed to aggression

Question 6

AO2 - MAOA
Brunner

Answer 6

Case Study – Netherlands = male borderline retardation – aggression – arson – rape == 5 male urine samples = low MAOA

Question 7

AO3

Answer 7

W - Causality
- Sampling issues
- Ecological validity
- Diathesis
S - Young - Mice Fierce gene
not generalisable but still useful