Question:
Which one of the following is necessary for evolution to be driven by genetic drift?
Which one of the following is necessary for evolution to be driven by genetic drift?
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Remember: Genetic drift = random change, strongest in small populations.
Updated On: Dec 11, 2025
- Migration
- Natural selection
- Rapid mutation
- Small population size
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The Correct Option is D
Solution and Explanation
Step 1: Understanding Genetic Drift.
Genetic drift refers to random changes in allele frequencies in a population over time. These changes occur by chance, not by natural selection.
Step 2: Key Requirement.
The effect of genetic drift is most pronounced in small populations, where random fluctuations can significantly alter allele frequencies. In large populations, the effect of drift is negligible.
Step 3: Conclusion.
Therefore, a small population size is necessary for evolution driven by genetic drift.
Genetic drift refers to random changes in allele frequencies in a population over time. These changes occur by chance, not by natural selection.
Step 2: Key Requirement.
The effect of genetic drift is most pronounced in small populations, where random fluctuations can significantly alter allele frequencies. In large populations, the effect of drift is negligible.
Step 3: Conclusion.
Therefore, a small population size is necessary for evolution driven by genetic drift.
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