The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a …

Examples include the bottleneck effect, where a disaster reduces population size, and the founder effect, where a small group starts a new population; both result in less genetic variation.

Explore how genetic drift, the bottleneck effect, and the founder effect shape population diversity. Understand how variation within a species provides material for evolution.

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That's the definition of evolution. When the gene frequency changes over generation in a population, that's what we call as evolution so the beetles have definitely evolved.

That is, it may have some positive and some negative effects on fitness. For instance, a particular coat color might make a rabbit less visible to predators, but also less attractive to potential mates.

Evolution due to chance events. The bottleneck effect and founder effect.

Examples include the bottleneck effect, where a disaster reduces population size, and the founder effect, where a small group starts a new population; both result in less genetic variation.

Test your knowledge of population genetics!

The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a …