biological approach twin studies evaluation ao3 + evolution

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5 Terms

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strength of twin studies

  • provides supporting evidence

  • for example, 46% CR in MZ twins and 20% CR in DZ twins, suggesting depression is at least partly genetic

  • supports the idea that psychological characteristics are determined by biology

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limitation of twin studies

  • research involves use of twin studies

  • identical twins are raised in the same environment, meaning not possible to disentangle role of genes and role of environment

  • can’t be sure whether CR is due to being genetically identical or being treated similarly

  • raises questions regarding validity

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evolution

process by which successive generations of organisms change

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genotype

genetic makeup inherited by an individual

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phenotype

  • observable characteristics of an individual that are expressed

  • and are a result of interaction between the genotype and the environment