Genetic drift operates in `:`

Options

A. small isolated population
B. large isolated population
C. non-reproductive population
D. slow reproductive population

Answer

### Step-by-Step Solution:

1. **Understanding Genetic Drift**:
- Genetic drift refers to the random changes in allele frequencies in a population from one generation to the next. It is a mechanism of evolution that can lead to significant changes in small populations.

2. **Identifying Population Size**:
- Genetic drift has a more pronounced effect in small populations compared to large populations. This is because random events can have a larger impact on the genetic makeup of a smaller group.

3. **Evaluating the Options**:
- **Option A: Small Isolated Population**: This is a suitable condition for genetic drift to operate effectively, as the random changes in allele frequencies can significantly alter the genetic structure.
- **Option B: Large Isolated Population**: In large populations, the effects of genetic drift are minimized because the larger gene pool buffers against random changes.
- **Option C: Non-Reproductive Population**: Genetic drift cannot operate in populations where reproduction does not occur, as there are no successive generations to observe changes in allele frequencies.
- **Option D: Slow Reproductive Population**: While reproduction is occurring, if the rate is slow, genetic drift may not manifest effectively, as changes may take longer to become apparent.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option A: Small Isolated Population**. Genetic drift operates most effectively in small populations due to the larger relative impact of random events on their genetic structure.