The data suggest a clear relationship between genetic similarity and personality similarity.

Question

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Studies have shown that genetic similarity is a significant predictor of personality similarity between individuals. Twins, who have identical genetics, have been shown to have greater personality similarity than non-twin siblings or unrelated individuals. However, environmental factors can also play a role in shaping personality, so genetic similarity is not the only determining factor.

The Data Suggest a Clear Relationship Between Genetic Similarity and Personality