Twin Studies
Mind map descrbing and showing strengths and weaknesses of twin studies
- Created by: dodo1818
- Created on: 07-11-14 11:55
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- Twin Studies
- Describe
- Focuses on CONCORDANCE RATES of twins with respect to disorder.
- MZ twins compared with DZ twins
- MZ twins have greater genetic similarity
- Both types grow up in identical environments
- If MZ CONCORDANCE is higher than DZ CONCORDANCE, a genetic component sugested
- Strengths
- Perfect control for genetic inheritance studies
- MZ twins share 100% DNA. DZ twins share 50% DNA
- Effect of nature vs. nurture can be studied effectively
- IV already manipulated
- More multiple births taking place
- Replicate findings of twin studies with other sample of other cultures
- Increase reliability and generalisability
- Replicate findings of twin studies with other sample of other cultures
- Usually nothing is manipulated only measured
- Also usually takes place in a natural setting
- Studies usually ethical and valid
- Also usually takes place in a natural setting
- Perfect control for genetic inheritance studies
- Weaknesses
- Twins not always exposed to same environmental influencese
- MZ twins are more likely to be treated the same than DZ twins
- E.g MZ twins more likely to be dressed the same than DZ twins
- Lack of validity
- MZ twins are more likely to be treated the same than DZ twins
- Difficulty in getting a large sample
- Difficult to get twins with exact requirements
- E.g hard to find willing twins where only one suffers from szhizophrenia
- Reduced generlisability
- Difficult to get twins with exact requirements
- Twin studies are often case study style
- Lack of generalisability
- Twins not always exposed to same environmental influencese
- Key Terms
- Concordance Rates
- The probability of one twin having the disorder if the other already has it. Expressed as a percentage
- Concordance Rates
- Describe
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