Genetic drift and gene fixation
In this simulation, there is fixation in the blue gene variation within five generations. Images these dots are beetles and some of them are destroyed by a wildfire. As the surviving population changes over time, some traits (red) may be completely eliminated from the population, leaving only the beetles with other traits (blue).
Source
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"Random sampling genetic drift."
http://en.wikipedia.org/wiki/File:Random_sampling_genetic_drift.svg
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