There are no intermediate stages in the course of evolution according to

Options

A. Use and disuse theory
B. Natural selection theory
C. Mutation theory
D. Modern synthetic theory

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which theory states that there are no intermediate stages in the course of evolution. This implies a theory that supports the idea of sudden changes leading to new forms without gradual transitions.

2. **Reviewing the Options**: The options given are:
- Use and disuse theory
- Natural selection theory
- Mutation theory
- Modern synthetic theory

3. **Analyzing Each Theory**:
- **Use and Disuse Theory**: This theory, proposed by Lamarck, suggests that organisms can change during their lifetime based on their use or disuse of certain traits. However, it does not specifically state that there are no intermediate stages in evolution.

- **Natural Selection Theory**: Proposed by Charles Darwin, this theory explains that evolution occurs through gradual changes driven by natural selection. It emphasizes the importance of intermediate stages as organisms adapt over time, so this is not the correct answer.

- **Modern Synthetic Theory**: This theory integrates genetics with Darwinian evolution, explaining how genetic variations contribute to evolution. It also supports gradual changes and does not claim the absence of intermediate stages.

- **Mutation Theory**: Proposed by Hugo de Vries, this theory suggests that evolution can occur through sudden mutations that create significant changes in organisms. It implies that these mutations can lead to new species without intermediate forms, making it the most relevant to the question.

4. **Conclusion**: Based on the analysis, the correct answer is **Mutation Theory** as it posits that there can be sudden changes in organisms leading to evolution without the presence of intermediate stages.

**Final Answer**: Mutation Theory

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