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Question #46457
The Question
Consider the evolutionary dynamics of Biston betularia (Industrial Melanism) and the principles of Genetic Drift. Which of the following statements is INCORRECT regarding the mechanisms altering their allele frequencies?
Options
- A.
Industrial melanism exemplifies directional selection, where allele frequencies shift deterministically due to phenotype-based differential survival.
- B.
The rapid decline of white-winged moths post-industrialization represents a population bottleneck, driving allele frequency changes primarily through genetic drift.
- C.
Unlike the selective pressure of predation in industrial melanism, genetic drift alters allele frequencies stochastically, regardless of phenotypic fitness.
- D.
In a highly polluted environment, the fixation of the melanic allele is a predictable outcome of natural selection, whereas fixation via drift is entirely random.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Allele Frequency Drift|Industrial Melanism
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse any 'rapid decline in population' with a 'bottleneck effect'.
The trap relies on failing to distinguish between a population reduction caused by specific selective pressure (predation based on camouflage = Natural Selection) and a reduction caused by random, non-selective events (natural disasters = Genetic Drift).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Evolution - Class 12 |
| Concept | Allele Frequency Drift |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |