15.3 Evolution in Action

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15.3 Evolution in Action
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Standards

• CLE 3210.5.5 Explain how evolution contributes to
  the amount of biodiversity
• CLE 3210.5.3 Explain how genetic variation in a
  population and changing environmental conditions
  are associated with adaptation and the emergence
  of new species.

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How does evolution work?

• Natural Selection can work in several ways

Convergent Evolution the process by which
unrelated species become more similar as they
adapt to the same kind of environment
Divergent Evolution the process by which two or
more related but reproductively isolated
populations become more and more dissimilar
Co-Evolution the process by which two or more
unrelated species evolve together because of a
symbiotic relationship.
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Convergent Evolution

• How it happens
• Example

Two genetically different species adapt to the
same environment in similar ways resulting in
similar phenotypes.
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Divergent Evolution

• How it happens
• Adaptive Radiation

One species branches off into two different
species due to changes in environment or
behavior.
an evolutionary pattern in which many species
evolve from a single ancestral species
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Co-Evolution

• How it happens

When two different species are dependent on each
other if one changes the other must adapt or go
extinct.
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Artificial Selection

• Human influence on natural selection.

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Exit Ticket

• m.socrative.com
• Room stewart348
• Compare and contrast natural selection with
  artificial selection