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Charles Darwin and Natural Selection

Charles Darwin and Natural Selection. Objectives: To explain Darwin’s theories of evolution by natural selection To discuss descent with modification. I. Darwin’s Ideas Influenced by:. A. Lamarck’s Theory of Evolution B. Voyage on the Beagle (1831-1836). Lava lizard. Swimming Lizard.

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Charles Darwin and Natural Selection

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  1. Charles Darwin and Natural Selection Objectives: To explain Darwin’s theories of evolution by natural selection To discuss descent with modification

  2. I. Darwin’s Ideas Influenced by: A. Lamarck’s Theory of Evolution B. Voyage on the Beagle (1831-1836)

  3. Lava lizard Swimming Lizard

  4. Land Iguana - Galapagos Marine Iguana - Galapagos Green Iguana – S. America

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  6. Influences on Darwin…

  7. TIME was very important to Darwin’s theory C. Geologists James Hutton and Charles Lyell 1. Earth is much older than a few thousand years 2. Processes shaping Earth have occurred for millions of years

  8. D. Thomas Malthus, Economist 1. Human population is increasing; competition for food, water, space 2. War, famine and disease prevents this

  9. E. Artificial Selection 1. Breeders select best traits to produce next generation

  10. II. Darwin’s Theory of Evolution by Natural Selection A. Over time, the number of individuals that carry advantageous traits will increase in a population B. Occurs in 4 steps…

  11. Darwin’s Theory of Evolution by Natural Selection 1. Living things overproduce

  12. Darwin’s Theory of Evolution by Natural Selection 2. There is variation among offspring

  13. Darwin’s Theory of Evolution by Natural Selection 3. There is a struggle to survive

  14. Darwin’s Theory of Evolution by Natural Selection 4. Those that survive are most fit

  15. C. Natural Selection: “Survival of the Fittest” 1. Fitness = ability to survive and reproduce 2. Fitness is the result of adaptations – inherited characteristics that increase an organism’s chance of survival

  16. Adaptation

  17. III. Descent with Modification A. Over time, natural selection produces organisms with different structures B. Today’s species look different from their ancestors C. Each species descended with changes over time

  18. 1965 1975 FORD MUSTANG 2005 1985 1995

  19. Descent with Modification D. Implies that all living things are related to one another E. COMMON ANCESTOR

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