Скачать или смотреть Founder & Bottleneck Effects: When Random Chance Takes Over Evolution

🌪️ The Power of Chance: Founder and Bottleneck Effects Explained (Amplifying Genetic Drift)
We know Genetic Drift is driven by pure chance. But what happens when a population is suddenly shrunk or separated? 🤯

This video dives into two dramatic population events that drastically amplify the effects of genetic drift: the Founder Effect and the Bottleneck Effect. These mechanisms illustrate how random, non-adaptive events can quickly and fundamentally change the genetic makeup of an entire population.

💥 Two Ways Chance Reshapes Genes:
1. The Founder Effect: This occurs when a new population is established by a non-representative subset of individuals from the original, larger population.

Result: The new, smaller population often has a much lower genetic diversity and allele frequencies that are significantly different from the original population, simply due to the limited, random sample that founded it.

2. The Bottleneck Effect: This occurs when a population undergoes a catastrophic reduction in size (e.g., due to a natural disaster, disease, or human activity).

Result: The surviving individuals represent only a random, often small, fraction of the original gene pool. This drastically reduces genetic diversity and leaves the population vulnerable to the intense, random forces of genetic drift in subsequent generations.

Both effects demonstrate that sometimes, evolution is driven by ecological disasters and demographic luck, not just "survival of the fittest."

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👍 Like this video if you understand the difference between the Founder and Bottleneck Effects.

💬 Comment below: Can you name a real-world example of the Founder Effect in a human population?

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