The lead author of "Genetic influences on core self-evaluations, job satisfaction, work stress, and employee health: A behavioral genetics mediated model," published in Organizational Behavior and Human Decision Processes, Judge studied nearly 600 twins -- some identical, some fraternal -- who were raised together and reared apart. He found that being raised in the same environment had very little effect on personality, stress and health. Shared genes turned out to be about four times as important as shared environment.
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This article also was mentioned in the Harvard Business Review.