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  • 1. AIM: How does evolution explain the diversity in the world? Warm – up: Give your definition of “evolution”
  • 2. What is Evolution? n Species living today are descended from species that lived in the past. n Evolution is the change over time in the heritable characteristics in a population from simple to complex.
  • 3. Charles Darwin
  • 4. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836)
  • 5. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836) n Observed the coastline of South America
  • 6. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836) n Observed the coastline of South America n Explored and observed organisms on the Galapagos Islands
  • 7. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836) n Observed the coastline of South America n Explored and observed organisms on the Galapagos Islands n Compared his observations between the two areas which led him to develop his idea of natural selection.
  • 8. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836) n Observed the coastline of South America n Explored and observed organisms on the Galapagos Islands n Compared his observations between the two areas which led him to develop his idea of natural selection. n Believed all species evolved from 1 ancestral type (common origins)
  • 9. Theory of Natural Selection
  • 10. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring.
  • 11. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring. n Overproduction: Organisms produce more offspring that are required to replace their parents and that can possibly survive.
  • 12. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring. n Overproduction: Organisms produce more offspring that are required to replace their parents and that can possibly survive. n Stabilization: Populations remain relatively constant with no population getting indefinitely large.
  • 13. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring. n Overproduction: Organisms produce more offspring that are required to replace their parents and that can possibly survive. n Stabilization: Populations remain relatively constant with no population getting indefinitely large. n Struggle for Existence: Competition for limited resources, struggle to avoid predation and disease.
  • 14. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring. n Overproduction: Organisms produce more offspring that are required to replace their parents and that can possibly survive. n Stabilization: Populations remain relatively constant with no population getting indefinitely large. n Struggle for Existence: Competition for limited resources, struggle to avoid predation and disease. n Survival of the Fittest: Individuals that are best adapted to their environment will have a selective advantage.
  • 15. Theory of Natural Selection n Natural variation: In a population, there are organisms with varying characteristics that are able to be inherited by offspring. n Overproduction: Organisms produce more offspring that are required to replace their parents and that can possibly survive. n Stabilization: Populations remain relatively constant with no population getting indefinitely large. n Struggle for Existence: Competition for limited resources, struggle to avoid predation and disease. n Survival of the Fittest: Individuals that are best adapted to their environment will have a selective advantage. n Selective Advantage: More likely to survive and reproduce than other less well-adapted organisms.
  • 16. Neo - Darwinism n Incorporation of new scientific evidence (genetics & molecular biology) n Has shown that natural variation stems from mutations in reproductive cells

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