The bottleneck effect is another form of genetic drift where an event drastically reduces the size of a population and consequently its genetic variation.
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Genetic Variation: Differences among individuals in their DNA sequence.
Survival of the Fittest: A concept that describes how only those organisms best adapted to their environment tend to survive and transmit their genetic characteristics to succeeding generations.
Natural Selection: The process whereby organisms better adapted to their environment tend to survive and produce more offspring.