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Understanding Evolution: Divergent, Convergent, and Coevolution Explained

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This overview delves into the intricacies of evolution, exploring divergent, convergent, and coevolution. Divergent evolution occurs when closely related species adapt to different environments, as seen in the red fox and kit fox. On the other hand, convergent evolution leads unrelated species to develop similar traits, like tuna and dolphins, when faced with comparable environmental challenges. Additionally, coevolution exemplifies mutual adaptations, particularly between plants and insects. Understanding these processes enhances our grasp of biodiversity and species interaction over time.

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Understanding Evolution: Divergent, Convergent, and Coevolution Explained

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  1. Patterns in Evolution

  2. Divergent Evolution • Defined: closely related species become increasingly different • Cause: Different environments • Ex: Red fox (forest) vs. Kit fox (desert)

  3. Kaibab Squirrel (Grand Canyon)

  4. Convergent Evolution • Defined: different species evolve similar traits due to a similar environment • Ex: Tuna (fish) and dolphins (mammals) • Advantage: Smooth, streamlined, flippers • Distantly related species with a similar environment (ocean)

  5. Dragonfly Convergent Evolution

  6. Coevolution • Defined: 2 or more species evolve in response to changes in each other • Ex: Plants and Insects • Plants: provide insects with nectar • Insect: transfers pollen from one plant to another

  7. Hummingbirds: Beak shape depends on flower shape Which hummingbird had adapted to feeding on the nectar of curved flowers?

  8. Extinction • Background Extinctions: • Less severe; local level • Forest fires, habitat destruction • Mass Extinctions: • Very severe; global level • 5 identified in earth’s history (volcanic activity, meteor strikes) Click to learn more

  9. How Fast Does Evolution Occur? • No exact time frame • Gradualism: slow & steady change of 1 species into another • Small changes continually build • Punctuated Equilibrium: Rapid periods of evolution • Due to sudden environment change • Ex: Mammal diversity exploded after dinosaur extinction • Examples of both models exist

  10. Gradualism of the Horse

  11. Kobe Kuiz • How is convergent and divergent evolution different? • What is thought to bring different organisms such as fish and dolphins to have evolved a similar body plan? • What is coevolution? • What does a flower gain from a close relationship with a hummingbird? • What does the hummingbird gain? • How is gradualism and punctuated equilibrium different?

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