genetic explanations

Question 1

what are the concordance rates for developing schizophrenia

Answer 1

general population - 1%
siblings- 9%
DZ twins - 17%
MZ twins - 48%

Question 2

what is a genetic explanation for developing schizophrenia and how is it determined?

Answer 2

• this suggests that scizophrenia runs within a family
• this occurs by studying family members and the occurance of schizophrenia

Question 3

why do mz twins have a higher concordance than others?

Answer 3

the more gees the person shares with the sufferer, the more likely they are to develop it
* this suggests that theres a genetic basis for the disorder and it is polygenic

Question 4

genetic explanation- strength

explain the work of Kety 1962

family studies

Answer 4

• kety compared the incidence of s between matched groups
• one had mothers with s and he others had mothers without
• 16.2% of babies with s mothers developed s comapred to only 1.9% of babies with no s mothers
• suggestings that those who develop s may have an inherited factor from thoer mum that gave them a vunerability to s

Question 5

whats a drawback of kety’s1962 work?

Answer 5

• there may be environmental factor that influence development of s
• a child who grows up around symptoms of s may think that the symptoms are normal behaviour and copy it