Darwinian evolution
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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

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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


Genetics Lesson 3


What assumptions need to be made for Hardy Weinberg?


Gene Pool

  • Why will it change?


Biston betularia


Peppered Moths

  • 1845 Industrial Revolution


Darwin’s Finches


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


Selection Pressures


Selection Pressures


Page 131 – Application


How do new Species come about?


Speciation

  • Development of a new species


Geographical Speciation


Reproductive Speciation


Reproductive Speciation

  • Oestrus

  • Mating Season

  • Anatomical changes

  • Behavioural changes


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