How chance, not just fitness, shapes the evolution of life
In short: Explore how random events can drastically alter the genetic makeup of a population. This video breaks down the mechanisms of genetic drift, the bottleneck effect, and the founder effect to explain why evolution isn't always a straight line of adaptation.
The video explores the fundamental biological concepts of genetic drift, which describes how allele frequencies change over time due to random chance rather than natural selection.
A bottleneck effect happens when a population's size is drastically reduced, leaving behind a small group that may not represent the original genetic diversity. The founder effect occurs when a small number of individuals colonize a new area. These processes matter because they can lead to a significant loss of genetic variation, impacting the long-term survival and adaptability of a species.
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Sources
- Summary by Intellect · source: Genetic drift, bottleneck effect and founder effect | Biology | Khan Academy
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