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Method / Topic: Biology
A sudden, random reduction in population size is a bottleneck. Because the survivors are an unrepresentative sample of the original gene pool, allele frequencies can change by genetic drift rather than by consistent fitness differences. For an MCAT biology problem, first identify the biological level being tested: molecule, cell, tissue, organ system, population, or experiment. Translate the stem into a cause-and-effect chain and use only the stated data plus a well-established biological principle. In physiology, follow the variable being regulated and decide whether the response is negative feedback. In genetics, separate parental from recombinant outcomes and show every probability step. In experiments, distinguish the manipulated variable, measured outcome, and appropriate comparison. Check units whenever a calculation is required. Then test every option against the mechanism; distractors often reverse direction, confuse correlation with causation, or name a true process occurring in the wrong cell, membrane, compartment, or stage. A final reasonableness check should confirm the
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
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- Mark the given values and the exact target.
- Apply the relevant formula, rule, or concept.
- Check the final value against the options.
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Correct Answer:
Method / Topic: Biology
A sudden, random reduction in population size is a bottleneck. Because the survivors are an unrepresentative sample of the original gene pool, allele frequencies can change by genetic drift rather than by consistent fitness differences. For an MCAT biology problem, first identify the biological level being tested: molecule, cell, tissue, organ system, population, or experiment. Translate the stem into a cause-and-effect chain and use only the stated data plus a well-established biological principle. In physiology, follow the variable being regulated and decide whether the response is negative feedback. In genetics, separate parental from recombinant outcomes and show every probability step. In experiments, distinguish the manipulated variable, measured outcome, and appropriate comparison. Check units whenever a calculation is required. Then test every option against the mechanism; distractors often reverse direction, confuse correlation with causation, or name a true process occurring in the wrong cell, membrane, compartment, or stage. A final reasonableness check should confirm the
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