Question:
Industrial melanism observed in different species of moths is an example of ____.
Industrial melanism observed in different species of moths is an example of ____.
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One extreme form (dark moth) was favoured and the population shifted towards it.
Updated On: Nov 12, 2026
- stabilizing selection
- directional selection
- ecological isolation
- ethological isolation
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Selection can be stabilising, directional or disruptive depending on which phenotype is favoured.
Step 2: The moth example
Soot darkened tree trunks, so dark peppered moths were better camouflaged and survived more than pale ones. The dark form increased steadily.
Step 3: Type of selection
Selection favoured one extreme phenotype and shifted the population mean towards it. This is directional selection.
Final Answer:
Industrial melanism is an example of directional selection. \[ \boxed{\text{(B) }\text{directional selection}} \]
Selection can be stabilising, directional or disruptive depending on which phenotype is favoured.
Step 2: The moth example
Soot darkened tree trunks, so dark peppered moths were better camouflaged and survived more than pale ones. The dark form increased steadily.
Step 3: Type of selection
Selection favoured one extreme phenotype and shifted the population mean towards it. This is directional selection.
Final Answer:
Industrial melanism is an example of directional selection. \[ \boxed{\text{(B) }\text{directional selection}} \]
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