Why can genetic drift be more effective in small isolated groups?
Answer and explanation
Correct answer: Because trait frequencies can change quickly by chance
Genetic drift is a random change in the frequency of alleles in a population. In a small group, each individual represents a larger fraction of the gene pool, so the accidental loss or reproduction of only a few individuals can change allele frequencies substantially in one or a few generations. Isolation prevents much gene flow from restoring the earlier frequencies. Thus A is correct; the other statements are biologically false.
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What is the correct answer to this question?
Because trait frequencies can change quickly by chance
Why is this the correct answer?
Genetic drift is a random change in the frequency of alleles in a population. In a small group, each individual represents a larger fraction of the gene pool, so the accidental loss or reproduction of only a few individuals can change allele frequencies substantially in one or a few generations. Isolation prevents much gene flow from restoring the earlier frequencies. Thus A is correct; the other statements are biologically false.
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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