In which type of natural selection does the peak get higher and narrower ?

Options

A. Balancing selection
B. Directional selection
C. Stabilizing selection
D. Both A & C

Answer

To solve the question "In which type of natural selection does the peak get higher and narrower?", we can analyze the options provided and understand the characteristics of each type of natural selection.

### Step-by-Step Solution:

1. **Understanding Natural Selection Types**:
- Natural selection can be categorized into different types, including stabilizing selection, directional selection, and balancing selection.

2. **Evaluating Option 1: Balancing Selection**:
- Balancing selection maintains multiple alleles in a population. It does not lead to a peak that is higher and narrower. Instead, it tends to keep the genetic diversity stable. Therefore, this option is incorrect.

**Hint**: Consider how balancing selection affects allele frequencies and diversity in a population.

3. **Evaluating Option 2: Directional Selection**:
- Directional selection favors one extreme phenotype over others, leading to a shift in the population mean. The peak in a graph representing this selection is typically broad, not higher and narrower. Thus, this option is also incorrect.

**Hint**: Think about how directional selection shifts the population mean towards one extreme.

4. **Evaluating Option 3: Stabilizing Selection**:
- Stabilizing selection favors intermediate phenotypes and reduces variation. This type of selection results in a peak that is higher and narrower, as it selects against extreme traits. Therefore, this is the correct answer.

**Hint**: Visualize how stabilizing selection impacts the distribution of traits in a population.

5. **Evaluating Option 4: Both A and C**:
- Since option A (balancing selection) is incorrect and option C (stabilizing selection) is correct, this combined option is also incorrect.

**Hint**: Analyze the correctness of each individual option before considering combinations.

### Conclusion:
The correct answer to the question is **Stabilizing Selection**, as it is the type of natural selection that results in a peak that is higher and narrower.