Twin Studies Flashcards
1
Q
Who did Christiansen (1977) study?
A
Over 3500 twin pairs in Denmark.
2
Q
What are identical twins called?
A
Monozygotic.
3
Q
What are non-identical twins called.
A
Dizygotic.
4
Q
What did Christiansen identify?
A
Concordance rates of criminal behaviour among twins.
5
Q
What were the concordance rates in monozygotic twins?
A
Male - 35%
Female - 21%
6
Q
What were the concordance rates among dizygotic twins?
A
Male - 13%
Female - 8%
7
Q
What two things did the data from concordance rates show?
A
Identical twins have higher concordance rates than non-identical.
Male twins have higher concordance rates than female twins.
