DDrift

Chapter 03 of 5

Nature and Nurture

What twins reveal about where personality comes from.

  1. The Question

    Genes or upbringing?

    Are we shaped more by our genes or our environment? Twins offer a natural way to find out.

  2. Identical Twins

    Same genes

    Identical twins share virtually all their DNA. Non-identical twins share about half, like ordinary siblings.

  3. The Logic

    Comparing twins

    If identical twins are more alike in a trait than non-identical twins, that suggests genes play a role.

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Could you answer this?

Roughly what share of personality differences do twin studies link to genes?

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🎭 What Makes You You?

  1. 01The Big FiveThe personality model psychologists actually rely on.
  2. 02Myers-Briggs on TrialWhy the world's most famous personality test is weak science.
  3. 03Nature and NurtureWhat twins reveal about where personality comes from.
  4. 04You Will ChangePersonality isn't set in stone — here's how it shifts through life.
  5. 05Why Horoscopes Feel TrueThe Barnum effect — and why vague descriptions feel personal.