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Genetics (Criticisms (MZ twins treated more similarly than DZ (so…
Genetics
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Evidence: Adoption
theory: MZ raised in separate homes... if experience then 0% similarity, if genetics then 100% similarity, if a combination then 50% (these aren't set just approximate)
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Evidence: Twin studies
Theory: If genes are deterministic/ all important... MZ twins will share 100% traits& behaviours while DZ twins will share 50%
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Bouchard: 50% of variance in personality in the population can be explained by genetics, shared-environment not significantly related, 50% variance explained by unique-environment
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polygenic risk score: research uses such large samples & sees interactions between genetics: no one factor causes vulnerability so its best to look at overall score to see probability of trait