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Natural selection is not the only mechanism through which populations evolve.

Explore gene flow, genetic drift, bottleneck effect, and founder effect in population evolution. Understand how these mechanisms shape genetic diversity and species formation.

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Natural selection is not the only mechanism through which populations evolve.

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  1. Natural selection is not the only mechanism through which populations evolve.

  2. bald eagle migration Gene flow is the movement of alleles between populations. • occurs when individuals join new populations and reproduce. • keeps neighboring populations similar. • Low gene flow increases the chance that two populations will evolve into different species.

  3. Genetic drift- a change in allele frequencies due to chance. • causes a loss of genetic diversity. • most common in small populations.

  4. The Bottleneck Effect- genetic drift that occurs after an event greatly reduces the size of population. * Alleles can be lost Examples Over Hunting Natural Disasters

  5. The founder effect- genetic drift that occurs after a small number of individuals colonize a new area.

  6. Sexual selection- occurs when certain traits increase mating success.

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