5.5 Speciation; Patterns in Evolution

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Biology

Evolution

Last updated 5:12 AM on 3/25/24
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7 Terms

1
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What are the Patterns of Evolution?

  1. Divergent Evolution

  2. Adaptive Radiation

  3. Convergent Evolution

  4. Coevolution

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Tell me about Divergent Evolution

  • two or more species evolve from a common ancestral species due to disruptive selection or genetic drift

<ul><li><p>two or more species evolve from a <strong><span style="color: blue">common ancestral</span></strong> species due to <mark data-color="purple">disruptive selection</mark> or <mark data-color="yellow">genetic drift</mark></p></li></ul>
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Tell me about Adaptive Evolution

  • divergent evolution occurs rapidly because many new habitats open up to a colonizing species

<ul><li><p>divergent evolution occurs <strong><span style="color: green">rapidly</span></strong> because many <strong><span style="color: yellow">new habitats</span></strong> open up to a colonizing species</p></li></ul>
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Tell me about Convergent Evolution

  • two species that do not share a recent common ancestor develop very similar structural or behavioural features because they experience similar selective forces

<ul><li><p>two species that <strong><span style="color: red">do not</span></strong> share a recent common ancestor develop very similar structural or behavioural features because they experience <strong><span style="color: blue">similar selective forces</span></strong></p></li></ul>
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<h1 collapsed="false">Explain Convergent Evolution in the Context of these two Animals</h1>

Explain Convergent Evolution in the Context of these two Animals

  • Sharks and dolphins are very similar in morphology, not because they have a recent common ancestor, but because they share a common environmental niche

<ul><li><p>Sharks and dolphins are very similar in morphology, not because they have a recent common ancestor, but because they share a common environmental niche</p></li></ul>
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Tell me about Coevolution

  • one species evolves in response to evolution of another species

<ul><li><p>one species evolves in response to evolution of another species</p></li></ul>
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<h1 collapsed="false">Explain Coevolution in the Context of these two Animals</h1>

Explain Coevolution in the Context of these two Animals

Leaf cutter ants have coevolved with a specific species of fungus

  1. Ants don’t eat leaves they cut

  2. Ants use leaves to grow fungus that they eat

<p>Leaf cutter ants have coevolved with a specific species of fungus</p><ol><li><p>Ants don’t eat leaves they cut</p></li><li><p>Ants use leaves to grow fungus that they eat</p></li></ol>