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Patterns of Evolution: Convergent Evolution, Coevolution & Divergent Evolution.

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Presentation on theme: "Patterns of Evolution: Convergent Evolution, Coevolution & Divergent Evolution."— Presentation transcript:

1 Patterns of Evolution: Convergent Evolution, Coevolution & Divergent Evolution

2 Convergent Evolution  Occurs when different organisms that live in similar environments become more alike in appearance and behaviour.  The environment selects similar adaptations in unrelated species.  Organisms develop analogous structures (same function, but different origins).  Examples: - Bird wings/insect wings - Shark fins/dolphin fins  Occurs when different organisms that live in similar environments become more alike in appearance and behaviour.  The environment selects similar adaptations in unrelated species.  Organisms develop analogous structures (same function, but different origins).  Examples: - Bird wings/insect wings - Shark fins/dolphin fins

3 More examples: Placental Mammals: top row Marsupial Mammals: bottom row

4 Coevolution  When two species evolve together.  There is a mutual evolutionary influence between two species.  The species have a symbiotic relationship (interaction between members of two populations).  Example: - Birds and flowers  When two species evolve together.  There is a mutual evolutionary influence between two species.  The species have a symbiotic relationship (interaction between members of two populations).  Example: - Birds and flowers

5 Divergent Evolution  The process by which an ancestral species gives rise to a number of new species that are adapted to different environmental conditions and are less alike.  Often occurs when a species colonizes a new environment.  Also known as adaptive radiation.  Examples: - Darwin’s Finches. - Brown bears and polar bears  The process by which an ancestral species gives rise to a number of new species that are adapted to different environmental conditions and are less alike.  Often occurs when a species colonizes a new environment.  Also known as adaptive radiation.  Examples: - Darwin’s Finches. - Brown bears and polar bears

6 Divergent Evolution

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