Which of the following best defines gene flow in the context of allelic frequency changes?

• A. An increase in the frequency of alleles that improve survival or reproduction due to natural selection
• B. Random fluctuations in allele frequencies due to chance events, especially in small populations
• C. Movement of alleles between populations via migration of individuals or transfer of gametes, which can change allele frequencies in the recipient population
• D. Non-random mating in which individuals preferentially mate with genetically similar partners, increasing homozygosity

Answer: (C)