1. A Darwinian View of Life
Chapter 22
A Darwinian View of Life

2. Natural Selection All organisms have variation (genetic differences).
More organisms are born than can survive.
Organisms with variations favorable for their environment are more likely to survive and reproduce (competition).
Over time, these advantageous characteristics will accumulate in the gene pool.

3. Early Ideas
Darwin’s Influences…

4. James Hutton
Gradualism!

5. Jean-Baptiste de Lamarck
Acquired Traits
WRONG!

6. Charles Lyell
Uniformitarianism
Earth is old!

7. Georges Cuvier
Paleontology
Extinctions

8. Thomas Malthus
Limited resources = competition

9. Observations

10. Artificial Selection

11. Variation

12. Adaptation

13. Biogeography

14. The Fossil Record

15. Embryological Similarities

16. Homologous Structures

17. Natural Selection All organisms have variation (genetic differences).
More organisms are born than can survive.
Organisms with variations favorable for their environment are more likely to survive and reproduce.
Over time, these advantageous characteristics will accumulate in the gene pool.