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AIM:
 How does evolution
explain the diversity in
      the world?
          Warm – up:
    Give your definition of
       ...
What is Evolution?
n Species living today are descended
  from species that lived in the past.
n Evolution is the change o...
Charles Darwin
Charles Darwin
n   Naturalist on HMS Beagle (1831 –
    1836)
Charles Darwin
n Naturalist on HMS Beagle (1831 –
  1836)
n Observed the coastline of South
  America
Charles Darwin
n Naturalist on HMS Beagle (1831 –
  1836)
n Observed the coastline of South
  America
n Explored and obser...
Charles Darwin
n Naturalist on HMS Beagle (1831 –
  1836)
n Observed the coastline of South
  America
n Explored and obser...
Charles Darwin
n   Naturalist on HMS Beagle (1831 –
    1836)
n   Observed the coastline of South
    America
n   Explored...
Theory of Natural Selection
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Theory of Natural Selection
n   Natural variation: In a population, there are organisms
    with varying characteristics t...
Neo - Darwinism

n Incorporation of new scientific
  evidence (genetics & molecular
  biology)
n Has shown that natural var...
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1.1

  1. 1. AIM: How does evolution explain the diversity in the world? Warm – up: Give your definition of “evolution”
  2. 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. 3. Charles Darwin
  4. 4. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836)
  5. 5. Charles Darwin n Naturalist on HMS Beagle (1831 – 1836) n Observed the coastline of South America
  6. 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. 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. 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. 9. Theory of Natural Selection
  10. 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. 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. 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. 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. 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. 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. 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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