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Charles Darwin and Natural Selection

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Charles Darwin and Natural Selection Darwin s Ideas Influenced by: Voyage on the Beagle (1831-1836) Lamarck s Theory of Evolution Also influenced by – PowerPoint PPT presentation

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Title: Charles Darwin and Natural Selection


1
Charles Darwin and Natural Selection
2
Darwins Ideas Influenced by
  • Voyage on the Beagle (1831-1836)
  • Lamarcks Theory of Evolution
  • Also influenced by

3
Geologists James Hutton and Charles Lyell
  • Hutton
  • Processes that form rock, mountains, and valleys
    are very slow
  • Earth is much more than a few thousand years old
  • Lyell
  • Geological processes we observe now have occurred
    for millions of years
  • Explains why marine fossils are at tops of
    mountains

4
Thomas Malthus, Economist
  • Babies born faster than people dying
  • If population growth continued, people would run
    out of food, water and space
  • War, famine and disease prevents this

5
Fossils
6
Artificial Selection
  • Breeders select best traits to produce next
    generation

7
Darwins Theory of Evolution by Natural Selection
  • Living things overproduce

8
Darwins Theory of Evolution by Natural Selection
  • There is variation among offspring

9
Darwins Theory of Evolution by Natural Selection
  • There is a struggle to survive

10
Darwins Theory of Evolution by Natural Selection
  • Those that survive are most fit

11
Natural Selection Survival of the Fittest
  • Fitness ability to survive and reproduce
  • Fitness is the result of adaptations inherited
    characteristics that increase an organisms
    chance of survival

12
Descent with Modification
  • Over time, natural selection produces organisms
    with different structures
  • Todays species look different from their
    ancestors
  • Each species descended with changes over time

13
Descent with Modification
  • Implies that all living things are related to one
    another
  • COMMON ANCESTOR
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