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Darwinian Evolution

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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  1. Darwinian Evolution • What does natural selection suggest?

  2. 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

  3. Genetics Lesson 3

  4. What assumptions need to be made for Hardy Weinberg?

  5. Gene Pool • Why will it change?

  6. Biston betularia

  7. Peppered Moths • 1845 Industrial Revolution

  8. Darwin’s Finches

  9. 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

  10. Selection Pressures

  11. Selection Pressures

  12. Page 131 – Application

  13. How do new Species come about?

  14. Speciation • Development of a new species

  15. Geographical Speciation

  16. Reproductive Speciation

  17. Reproductive Speciation • Oestrus • Mating Season • Anatomical changes • Behavioural changes

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