Which of the following is **not** a force that changes allele frequencies (causing evolution)?
AMutation
BNatural selection
CGenetic drift
DRandom mating in a large population
Answer & Solution
Correct answer: D. Random mating in a large population
Random mating in a large population (one of Hardy-Weinberg's assumptions) does NOT change allele frequencies. Mutation introduces new alleles; selection favours some over others; drift randomly fluctuates them; gene flow exchanges them. Random mating only redistributes existing alleles among genotypes.
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