The role " isolation " in evolution is for :

Options

A. Preserve the identify of a species
B. Formation of new species
C. Causes natural selection
D. Open the gene pool

Answer

### Step-by-Step Solution:

1. **Understanding Isolation**:
- Isolation in evolution refers to barriers that prevent different populations from interbreeding. This can occur due to geographical or reproductive barriers.

2. **Types of Isolation**:
- **Geographical Isolation**: This occurs when a physical barrier (like mountains, rivers, or distance) separates members of a population. For example, if a river forms between two groups of the same species, they can no longer interbreed.
- **Reproductive Isolation**: This happens when members of a population cannot reproduce due to various reasons (e.g., differences in mating seasons, polyploidy in plants, etc.).

3. **Consequences of Isolation**:
- When populations are isolated, they adapt to their unique environments over time. This can lead to significant genetic changes, eventually resulting in the emergence of new species.

4. **Evaluating Options**:
- The question provides multiple choices regarding the role of isolation in evolution:
- **Option 1**: To preserve the identity of a species - Incorrect.
- **Option 2**: To form new species - Correct.
- **Option 3**: Causes natural selection - Incorrect.
- **Option 4**: Open gene pool - Incorrect.
- Based on the understanding of isolation, the correct answer is that isolation plays a crucial role in the formation of new species.

5. **Conclusion**:
- Therefore, the role of isolation in evolution is primarily to facilitate the formation of new species through geographical and reproductive barriers.