NEET 2016 Phase 2 · BiologyPrevious Year Question
Genetic drift operates in
Answer: (A) Small isolated population. Answer: (A) Small isolated population.
- A.Small isolated population✓
- B.Large isolated population
- C.Non-reproductive population
- D.Slow reproductive population
Correct Answer
(A) Small isolated population
Solution & Explanation
Answer: (A) Small isolated population. Genetic drift is random change in allele frequencies by chance, and chance fluctuations have a large effect only when the population (sample) is small and isolated; in large populations such random changes average out. NCERT links genetic drift to chance change and to the founder effect, both of which involve small samples of a population. NCERT Reference: Ch 6 Evolution, p.121, lines 21–24: "If the same change occurs by chance, it is called genetic drift. Sometimes the change in allele frequency is so different in the new sample of population that they become a different species."
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