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Darwinian Evolution . What does natural selection suggest?. Darwinian Evolution . What does natural selection suggest? Organisms compete to survive Organisms produce more offspring than those that survive The fittest organisms survive They reproduce and pass on their genes.

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Darwinian evolution
Darwinian Evolution

  • What does natural selection suggest?


Darwinian evolution1
Darwinian Evolution

  • What does natural selection suggest?

    • Organisms compete to survive

    • Organisms produce more offspring than those that survive

    • The fittest organisms survive

    • They reproduce and pass on their genes




Gene pool
Gene Pool

  • Why will it change?



Peppered moths
Peppered Moths

  • 1845 Industrial Revolution



Selection
Selection

  • Selection may favour one particular allele = an advantageous allele

  • Selection may remove the extremes

  • The Environment has an effect on all genes

  • If the environment changes, the organisms best suited to survive will change






Speciation
Speciation

  • Development of a new species




Reproductive speciation1
Reproductive Speciation

  • Oestrus

  • Mating Season

  • Anatomical changes

  • Behavioural changes


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