Moderate

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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