LS3 - Genetic Factors In Aggression

Question 1

Male Chromosomes

Answer 1

XY

Question 2

Female Chromosomes

Answer 2

XX

Question 3

Genetic Explanation

Answer 3

People think the Y gene is responsible for aggression and therefore mans that are XYY being very aggressie

Question 4

Twin Studies

Answer 4

Coccaro Et Al found the concordance rate in physical aggression for MZ twins was 50% and DZ twins was 17%. For verbal aggression MZ 28% and DZ 7%.

Question 5

MZ and DZ Twins

Answer 5

MZ twins are exactly identical whilst DZ twins are half identical and can be different genders and shit

Question 6

Adoption Studies

Answer 6

Rhee & Waldman carried out a meta-analysis for adoption studies on aggressive behaviour and found genetic influence accounted for 41%.

Question 7

MAOA Gene

Answer 7

Responsible for producing monamine oxidase which metabolises adrenaline, serotonin and dopamine. If this dysfunctions then those hormones aren’t broken down properly, resulting in too much adrenaline and hypersensitivity for fight and flight.

Question 8

Strengths (+)

Answer 8

Twin Studies
Removing MAOA Gene
MAOA - L (Warrior Gene)

Question 9

Weaknesses (-)

Answer 9

YY Only Responsible For Physical Characteristics
Validity Of Twin Studies

Question 10

Twin Studies (+)

Answer 10

Coccaro Et Al found the concordance rate in physical aggression for MZ twins was 50% and DZ twins was 17%. For verbal aggression MZ 28 and DZ 7.

Question 11

Coccaro Et Al (+)

Answer 11

Coccaro Et Al found the concordance rate in physical aggression for MZ twins was 50% and DZ twins was 17%. For verbal aggression MZ 28 and DZ 7.

Question 12

Removing MAOA Gene Study (+)

Answer 12

Godar Et Al - Specifically removed the MAOA gene showing increased aggression and higher levels of serotonin. However, once these were regulated, they returned back to normal.

Question 13

MAOA - L (+)

Answer 13

Banner studies 28 men repeatedly involved in violent crimes and they all had the MAOA - L gene.

Question 14

YY Only Responsible For Physical Characteristics (-)

Answer 14

Researched XYY people and found it can increase height but not aggression therefore we can’t generalise the XYY gene for aggression