Moderate

Recent work in behavioural genetics has examined the contribution of genetic and environmental factors to human behavior. But which of the four assertions below is NOT true?

Correct answer: C. Adoption studies have shown that environment plays no part in the development of personality

  • A. Research as shown monozygotic twins to have much more similar personality traits than dizygotic twins
  • B. Both adoption studies and twin studies are consistent with a genetic influence on personality
  • C. Adoption studies have shown that environment plays no part in the development of personality
  • D. Children who are genetically more active and impulsive can cause their parents to be more responsive to their needs than other children

Explanation

Adoption findings do not show that environment has no role; they generally indicate both genetic and environmental influences on personality. The other statements describe accepted findings such as greater similarity among identical twins and gene–environment correlation.

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