By measuring the extent to which identical twins reared together score differently on intelligence tests researchers can determine the influence of which factors on intelligence?
Correct answer: B. Non-shared environments
- A. Shared environments
- B. Non-shared environments
- C. Shared and non-shared environments
- D. Genetic traits
Explanation
Identical twins reared together share nearly the same genes and family environment, so score differences mainly point to non-shared environmental influences, along with measurement error. Shared environments would instead be inferred from similarities between the twins.
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