In which condition can genetic drift be most influential?
Answer and explanation
Correct answer: In a small isolated population
Genetic drift is a random change in the frequency of alleles, rather than a change caused by a trait being advantageous. Random survival or reproduction has a much larger effect when the population is small, and isolation prevents outside individuals from restoring the original frequencies. Therefore, option B is correct. In a very large population, chance effects are usually weaker; no variation leaves little frequency difference to change, and equal selection does not describe drift.
Frequently asked questions
What is the correct answer to this question?
In a small isolated population
Why is this the correct answer?
Genetic drift is a random change in the frequency of alleles, rather than a change caused by a trait being advantageous. Random survival or reproduction has a much larger effect when the population is small, and isolation prevents outside individuals from restoring the original frequencies. Therefore, option B is correct. In a very large population, chance effects are usually weaker; no variation leaves little frequency difference to change, and equal selection does not describe drift.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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