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- Psychologists use several approaches to determine the relative influence of genetic and environmental factors on behavior.
- Researchers can experimentally control the genetic makeup of laboratory animals by carefully breeding them for specific traits.
- Human twins serve as another important source of information about the relative effects of genetic and environmental factors.
If identical twins display different patterns of development, such differences have to be attributed to variations in the environment.
- Researchers can also consider people raised in similar environments who have totally dissimilar genetic backgrounds.
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