Genetic Drift Review

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• A change in a species of organisms over time.
• When a series of chance events like disease, hurricanes, tornadoes, fires, earthquakes and other disastrous events cause an allele to become more or less common in a population of organisms.
• Organisms that have beneficial traits in an environment will survive, reproduce, and therefore pass their genes to the next generation.
• A change in allele frequency or how often an allele occurs after a large reduction in the size of a population.
• When a few individuals move away from the original population and live in a new area where there are no other organisms.