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Chemistry LibreTexts

Other Mechanisms of Evolution

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  • Take the time to watch the Crash Course video, Population Genetics: When Darwin Met Mendel. The key concepts you need to pay attention to in this video are: gene flow, genetic drift, bottleneck effect, sexual selection and founder effect

    To sum up some of the key points:

    • Gene flow - occurs when individuals join new populations and reproduce, this is what keeps neighboring populations similar. Low gene flow increases the chance that two populations will eventually evolve into different species
    • Genetic drift - is a change in allele frequency due to chance, this causes a loss of genetic diversity. This is common in small populations, and it can be caused by a population bottleneck. Genetic drift can have negative effects on a population
    • Founder effect - this occurs after the start of a new population
    • Sexual selection occurs when certain traits increase mating success

    For a short review, visit these Berkeley Evolution 101 pages: