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

Options

A. Tail has the power of regeneration
B. Mutation theory is wrong
C. Lamarckism was wrong in the inheritance of accquired character
D. Tail is an essential organs .

Answer

To solve the question regarding Weismann's experiment with mice tails, we need to analyze the implications of his findings in relation to evolutionary theories, particularly Lamarckism.

### Step-by-Step Solution:

1. **Understanding the Experiment**: Weismann conducted an experiment where he cut off the tails of mice generation after generation. The expectation based on Lamarck's theory would be that if an organ (like the tail) is not used, it should eventually disappear or become vestigial over generations.

2. **Observation of Results**: After several generations of cutting the tails, Weismann observed that the tails neither disappeared nor shortened. This was contrary to what Lamarck's theory predicted.

3. **Lamarckism Overview**: Lamarckism posits that organisms can pass on traits acquired during their lifetime to their offspring. For example, if a mouse had its tail cut and did not use it, Lamarck would argue that future generations would be born without tails.

4. **Conclusion from Weismann's Findings**: Since the tails continued to appear in subsequent generations despite being cut off, this indicated that the inheritance of acquired characteristics (a key component of Lamarckism) was incorrect. The traits of the mice were not influenced by the cutting of the tails.

5. **Evaluating the Options**:
- **Option A**: "Tail has the power of regeneration" - This does not relate to the experiment's findings.
- **Option B**: "Mutation theory is wrong" - This is not relevant to the experiment.
- **Option C**: "Lamarckism was wrong in the inheritance of acquired characters" - This is supported by Weismann's findings.
- **Option D**: "Tail is an essential organ" - This is incorrect because mice can survive without tails.

6. **Final Answer**: The correct conclusion from Weismann's experiment is that "Lamarckism was wrong in the inheritance of acquired characters."