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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.

Related tags

Genetic DriftSmall PopulationRandom ChangeHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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