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In which of the following cases would you expect to find the greatest similarity in IQ?

Correct answer: B. between identical twins

  • A. between fraternal twins
  • B. between identical twins
  • C. between non-twin siblings
  • D. between parent and child

Explanation

Identical twins share nearly all of their genes, so their IQ scores tend to be more similar than those of fraternal twins, ordinary siblings, or parent-child pairs. Shared environment also contributes, but genetic similarity is greatest for identical twins.

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