aggression- genetic factors

Question 1

who studies the genetic factors in aggression with twin studies?

Answer 1

-Coccaro et al. (1997)

Question 2

what did Coccaro et al find for direct physical aggression?

Answer 2

concordance rates for 50% for MZs and 19% for DZs

Question 3

what did Coccaro et al find for verbal aggression?

Answer 3

-28% for MZ and 7% for DZ

Question 4

what the variance in aggressive behaviour for aggression for twin studies?

Answer 4

50%

Question 5

what is the variance in behaviour for adoption studies?

Answer 5

41%

Question 6

what do adoptive studies suggest about aggression and genetics/ environmental factors?

Answer 6

-similarities in aggressive behaviour between an adopted child an biological parents suggest genetic influences are operating
-but similar with adoptive parents suggest environmental factors

Question 7

who found a 41% variance of aggression?

Answer 7

Rhee and Waldman with their meta analysis