If gene frequencies in a population change suddenly because of small population size, this is an example of what?
Answer and explanation
Correct answer: Genetic drift
Genetic drift is a change in allele or gene frequencies caused by chance rather than by a consistent selective advantage. Its effect is especially strong in small populations because random sampling can greatly alter which alleles are passed to the next generation. A sudden reduction may produce a bottleneck effect, while a small founding group may produce a founder effect. Therefore A is correct; natural selection is non-random differential success, and the other choices do not describe this population process.
Frequently asked questions
What is the correct answer to this question?
Genetic drift
Why is this the correct answer?
Genetic drift is a change in allele or gene frequencies caused by chance rather than by a consistent selective advantage. Its effect is especially strong in small populations because random sampling can greatly alter which alleles are passed to the next generation. A sudden reduction may produce a bottleneck effect, while a small founding group may produce a founder effect. Therefore A is correct; natural selection is non-random differential success, and the other choices do not describe this population process.
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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