Natural selection leads to the directional change when

Options

A. More individual acquires mean character value in the distribution curve
B. More individual acquires peripheral character value of both ends of distribution curve
C. More individual acquire value other then the mean character value at any one end of distribution curve
D. No individual acquires the peripheral character value

Answer

To answer the question "Natural selection leads to the directional change when," we will analyze the options provided and understand the concept of natural selection and its types.

### Step-by-Step Solution:

1. **Understand Natural Selection**:
- Natural selection is a process where individuals with traits that are better suited to their environment tend to survive and reproduce more than those without such traits. This leads to changes in the traits of a population over time.

2. **Identify Types of Selection**:
- There are three main types of natural selection:
- **Stabilizing Selection**: Favors average traits and reduces variation.
- **Disruptive Selection**: Favors extreme traits at both ends of the spectrum, leading to a split in the population.
- **Directional Selection**: Favors one extreme trait over others, causing the population to shift in one direction.

3. **Analyze Each Option**:
- **Option 1**: "More individuals acquire mean character value in the distribution curve."
- This describes stabilizing selection, which does not lead to directional change.
- **Option 2**: "More individuals acquire peripheral character value of both ends of the distribution curve."
- This describes disruptive selection, which also does not lead to a single directional change.
- **Option 3**: "More individuals acquire value other than the mean character value at any one end of the distribution curve."
- This describes directional selection, where the population shifts towards one extreme.
- **Option 4**: "No individual acquires the peripheral character value."
- This option does not describe any type of selection relevant to directional change.

4. **Conclusion**:
- The correct answer is **Option 3**: "More individuals acquire value other than the mean character value at any one end of the distribution curve." This indicates that natural selection leads to a directional change by favoring traits that are not average, causing a shift in the population towards one extreme.

### Final Answer:
Natural selection leads to the directional change when **more individuals acquire value other than the mean character value at any one end of the distribution curve** (Option 3).

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