Davidson: Identical twins

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Meindert Hobbema (Dutch, 1638-1709)
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“Identical twins are thus twice as similar genetically as non-twin siblings and should thus be about twice as similar as fraternal twins on any traits that have a genetic component.
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Put another way, when the similarity between identical twins is greater than it is between fraternal twins for a particular trait, that’s a strong sign that the trait has a genetic basis.
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Twin studies have therefore been a gold mine for clues to the genetic basis of temperament, personality, and Emotional Style.
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Among the traits that are more similar in identical twins than in fraternal, and thus have a strong genetic basis,
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are shyness,
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sociability,
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emotionality,
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tendency to experience distress,
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adaptability,
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impulsivity,
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and the balance of positive and negative emotions.
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