Genetic drift: entirely random process, change in population’s frequency of an allele by chance, reduced genetic variation means that the population may not be able to adapt to new selection pressures, Gene flow: gene frequency changes as members of a species move from 1 group to another, , immigration--new variation of alleles enters a population , Natural selection: organisms with more advantageous traits in a population, have more offspring, passing those traits to next generation, adaptation, gene frequency changes based on most "fit" traits, broken or repaired DNA strands that produce new alleles that can lead to greater fitness, change in genetic material producing new alleles, , ,

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