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Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that

1. Darwin was correct
2. Tail is an essential organ
3. Mutation theory is wrong
4. Lamarckism was wrong in inheritance of acquired characters

Correct answer: Lamarckism was wrong in inheritance of acquired characters

Solution

Weismann’s mice experiment showed that removing tails in parents did not produce tailless or shorter-tailed offspring. This means acquired changes are not inherited, which contradicts Lamarck’s idea of inheritance of acquired characters.

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