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Heredity and Heritability

Suvrat Kher is appalled at the way ToI reported recent research on happiness variations among people:

The common sense notion of heredity is that parents pass on traits to their children. The common interpretation of this is that since personality traits may be inherited, this study shows that an individual inherits 50% of the capacity to be happy from his/her parents. This is simple untrue and a completely meaningless statement. What was been measured in the study using twin pairs is heritability [...]

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