Which of these research methods would a psychologist be likely to employ to study the influence of genetics on personality?
A) examining correlations in personality between pairs of identical and fraternal twins
B) interviewing people who have known others who were particularly odd or unique
C) administering paper and pencil or computerized questionnaires to hundreds of people
D) documenting the patterns of development and difficulties of psychiatric patients
Answer: A
Rationale: Because identical and fraternal twins differ primarily in the amount of DNA they share, comparing the correlation in personality between identical twins to fraternal twins can be used to estimate the heritability of personality.
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