Twin And Adoption Study

Question 1

Twin study

Answer 1

Monozygotic-100%
Dizygotic-50%
Allows to compare nature and nurture

Question 2

Twin study evaluation

Answer 2

+
Twin registries
Investigate gene influence
-
Overestimate genetic influence
Broad indication on genetic similarity

Question 3

Gottesman and Shields

Answer 3

Genetic factors of schizophrenia
Mz 42x more likely if one already had
Dz 9x

Question 4

Adoption study

Answer 4

Share same gene, different environment

Question 5

Adoption study evaluation

Answer 5

+
Removes extraneous variables
Twin study overestimate genes
-
Selective placement
Not reflective of normal family

Question 6

Horn et Al

Answer 6

Genes and Age-positive correlation