Question

Natural selection where more individuals acquire a specific character value other than the mean character value, leads to:

• A. Stabilising change
• B. Directional change
• C. Disruptive Change
• D. Random Change

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Natural selection can change the distribution of traits in a population in three main ways: Stabilizing, Directional, and Disruptive.
Detailed Explanation:
1. Stabilizing Selection: Favors the average (mean) individuals. The peak gets higher and narrower.
2. Directional Selection: Favors individuals at one extreme of the trait distribution. The entire curve (peak) shifts in that specific direction. This happens when individuals acquire values other than the mean.
3. Disruptive Selection: Favors individuals at both extremes. Two separate peaks are formed.
Step 2: Final Answer:
The shift toward a specific value other than the mean is a Directional change.