In which type of natural selection two peaks are form:

Options

A. Stabilising or normalising selection
B. Directional or progressive selection
C. Diversifying or disruptive selection
D. Balancing selection

Answer

To solve the question regarding the type of natural selection that forms two peaks, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Natural Selection**: Natural selection is a process where organisms better adapted to their environment tend to survive and produce more offspring. This concept was introduced by Charles Darwin and is a key mechanism of evolution.

2. **Identify Types of Natural Selection**: There are three main types of natural selection:
- **Stabilizing Selection**: This type favors the average phenotype and reduces variation. It results in a single peak on a graph representing the distribution of traits.
- **Directional Selection**: This type favors one extreme phenotype over the other, causing a shift in the population's traits in one direction. It results in a single peak that moves towards one end of the spectrum.
- **Disruptive (or Diversifying) Selection**: This type favors both extreme phenotypes over the average phenotype, leading to the formation of two distinct peaks on a graph.

3. **Analyze the Graphs**:
- For **stabilizing selection**, the graph shows a single peak at the mean value.
- For **directional selection**, the graph shows a single peak that shifts to one side.
- For **disruptive selection**, the graph displays two peaks, indicating that both extremes are favored while the average is selected against.

4. **Conclusion**: Since the question specifically asks for the type of natural selection that results in two peaks, the correct answer is **disruptive selection**.

### Final Answer:
The type of natural selection that forms two peaks is **disruptive or diversifying selection**.

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