Gene pool of a population tends to remain stable if the population is large, without large scale mutations, without migration and with

Options

A. Random mating
B. Moderate environmental changes
C. Natural selection
D. Reduction in predators

Answer

To solve the question regarding the stability of the gene pool in a population, we need to analyze the conditions under which a gene pool remains stable. The question states that the gene pool tends to remain stable if the population is large, without large-scale mutations, without migration, and with which additional factor?

### Step-by-Step Solution:

1. **Understanding the Gene Pool**:
- The gene pool refers to the total genetic diversity found within a population. A stable gene pool indicates that the genetic composition of the population does not change significantly over time.

2. **Identifying Key Conditions**:
- The question provides three conditions:
- The population is large.
- There are no large-scale mutations.
- There is no migration.

3. **Analyzing the Options**:
- We need to evaluate the given options to determine which one contributes to the stability of the gene pool:
- **A. Random Mating**
- **B. Moderate Environmental Changes**
- **C. Natural Selection**
- **D. Reduction in Predators**

4. **Evaluating Each Option**:
- **Option A: Random Mating**:
- Random mating ensures that all individuals have an equal chance of reproducing. This helps maintain genetic diversity and stability in the gene pool.
- **Option B: Moderate Environmental Changes**:
- Moderate environmental changes can lead to shifts in the population dynamics and may affect the gene pool negatively.
- **Option C: Natural Selection**:
- Natural selection tends to favor certain traits over others, which can lead to changes in the gene pool, thus destabilizing it.
- **Option D: Reduction in Predators**:
- A reduction in predators can lead to population booms and changes in the ecosystem, which does not directly contribute to the stability of the gene pool.

5. **Conclusion**:
- Given the analysis, the correct answer is **A. Random Mating**. Random mating is essential for maintaining a stable gene pool in a large population without mutations and migration.

### Final Answer:
The gene pool of a population tends to remain stable if the population is large, without large scale mutations, without migration, and with **random mating**.