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Lamarck predicted that changes inherited in the parent's own lifetime would be inherited. This would mean, among other things that:

  • A parent mouse has its tail chopped off. It would have tailless offspring.
  • A blacksmith with strong muscles (due to his trade) will have stronger offspring than an otherwise identical non-blacksmith.
  • Children would inherit any scars their parents had.

None of the three above scenarios are the case, contrary to what Lamarck predicted.

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