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natural selection

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  • Principle #1 - genetic variation  Variation exits in most animals, even rats.  In this example some are black and some are grey. 
  • Principle #2 - Overproduction and the Struggle for Existence  When rats have off springs, not all survive.
  • Principle #3 - Differential Survival and Reproduction The black rat have the ability to camaflogue  against the dark, on the other hand the rats an easily be seen by the owl. 
  • Principle #3 - Differential survival and Reproduction  Since the dark rats camaflogue, they survive longer 
  • Principle #4 - Changes in Gene Pool The darker rats have a better change of living and producing an offspring, they have a bigger gene pool. 
  • And thats natural selection 
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