Biological Factors: Genetic Factors

Question 1

what happens if you are genetically related to someone with schizophrenia?

Answer 1

your chances of developing the condition are increased

Question 2

what do studies look at?

Answer 2

concordance rates

Question 3

what kind of studies are used?

Answer 3

family and twin studies

Question 4

main study for genetic factors

Answer 4

Gottesman (1991)

Question 5

what did Gottesman (1991) do?

Answer 5

he reviewed about 40 twin studies

Question 6

what did Gottesman find?

Answer 6

identical twins (MZ) have a 48% concordance rate
non identical twins (DZ) have a 17% concordance rate

Question 7

identical twins concordance rate

Answer 7

48%

Question 8

non identical twins concordance rate

Answer 8

17%

Question 9

what does Gottesman’s study assume?

Answer 9

if the twins have the same environmental influences, then the difference in the concordance must be down to their genetics

Question 10

how much DNA do identical twins share?

Answer 10

100%

Question 11

how much DNA do non identical twins share?

Answer 11

50%

Question 12

supporting study

Answer 12

Shields (1962)

Question 13

what did Shields (1962) find?

Answer 13

MZ twins raised in different families still showed around 50% concordance

Question 14

is Shields a supporting or disproving study?

Answer 14

supporting

Question 15

disproving evidence against genetic factors

Answer 15

no study has found a 100% concordance rate between MZ twins so schizophrenia can’t just be genes

Question 16

if schizophrenia can’t just be caused by genes…

Answer 16

there must be other factors