EVOLUTION IN ACTION

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EVOLUTION IN ACTION

• pp. 308-311

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Evolution defined

• Evolution of a population is due to environment
  and the interaction of other species

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Artificial Selection

• humans breed for specific traits causing
  differences in species (i.e. dog breeding)

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Examples of Evolution

• Convergent evolution Organisms with very
  different ancestors become more alike due to a
  common environment (i.e fish and whales)- compare
  analogous structures

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• Divergent evolution populations become more and
  more dissimilar to adapt to the
  environment-compare homologous structures
• EX. appearance of birds with different sized
  beaks that are specific for size of bird seed

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Adaptive radiation

• population undergoes divergent evolution until it
  fills all areas of the environment

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• Co-evolution as one species evolves another does
  (parasites and hosts)