In which situation can both natural selection and genetic drift change the structure of a population?
Answer and explanation
Correct answer: When variations exist and some changes increase by advantage or chance
Population structure changes when the frequencies of inherited traits or alleles change across generations. Natural selection increases variants that improve survival or reproduction, whereas genetic drift changes frequencies randomly, especially in small populations. Both processes therefore require heritable variation and reproduction. Option A includes both advantage, representing selection, and chance, representing drift. Without variation or offspring, these evolutionary changes cannot be sustained.
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What is the correct answer to this question?
When variations exist and some changes increase by advantage or chance
Why is this the correct answer?
Population structure changes when the frequencies of inherited traits or alleles change across generations. Natural selection increases variants that improve survival or reproduction, whereas genetic drift changes frequencies randomly, especially in small populations. Both processes therefore require heritable variation and reproduction. Option A includes both advantage, representing selection, and chance, representing drift. Without variation or offspring, these evolutionary changes cannot be sustained.
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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