genetic factors in aggression

Question 1

what are genetic factors?

Answer 1

Genes influence each individual’s behavioral and psychological characteristics,

Question 2

what is an MAOA gene and how can it affect aggression?

Answer 2

responsible for activity of enzyme in the brain, lower the variant the higher the aggressive behaviour

Question 3

what 4 things must we remember in genetic factors in aggression?

Answer 3

twin studies
adoption studies
MAOA gene
gene environment interaction

Question 4

what do twin studies show?

Answer 4

heritability account for 50% of variance in aggressive behaviour

Question 5

who conducted research into twin studies?

Answer 5

Coccaro et al

Question 6

what did Coccaro et al study?

Answer 6

male MZ and DZ twins

Question 7

what did Coccaro et al expect?

Answer 7

greater similarity in aggressive behaviour in MZ twins

Question 8

the results for aggression defined as direct assault were…

Answer 8

50% MZ and 19% DZ

Question 9

the results for aggression defined as verbal assault were…

Answer 9

28% MZ and 7% DZ

Question 10

who conducted research for adoption studies?

Answer 10

rhee and waldman

Question 11

what did rhee and waldman do?

Answer 11

metanalysis of adoption studies showing that genetic factors account for 41% of variance in agg

Question 12

what is the MAOA gene?

Answer 12

Monoamine oxidase A (MAOA) is an enzyme that breaks down important neurotransmitters in the brain, including dopamine and serotonin

Question 13

what does dysfunction lead to?

Answer 13

abnormal operation of MAOA gene, increased level of serotonin

Question 14

who studied MAOA gene?

Answer 14

Brunner et al

Question 15

what did Brunner et al do?

Answer 15

studied the link between MAOA- L gene activty in 28 males members of large Dutch family who were repeatedly involved in violent acts

Question 16

what did Brunner et al find?

Answer 16

they had abnormally low levels of the MAO-A enzyme and MAO-L gene variant

Question 17

what is the gene environment interaction?

Answer 17

genes and environment having an affect on aggressive behaviour , genes do not function in isolation

Question 18

what does the MAOA gene interact with?

Answer 18

MAOA gene interacts with early tramuatic life expereinces

Question 19

who studied gene environment interaction?

Answer 19

frazzetto et al

Question 20

what did frazzeto et al find?

Answer 20

an assosiation between higher levels of anti-social aggression and MAOA-L gene in adult males , only if experienced signficiant trauma like abuse

Question 21

what is the gene environment interaction an example of?

Answer 21

diathesis-stress model