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Charles Darwin and Natural Selection

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Charles Darwin and Natural Selection Objectives: To identify the people who influenced Darwin in the development of his ideas To explain Darwin s theories of ... – PowerPoint PPT presentation

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Title: Charles Darwin and Natural Selection


1
Charles Darwin and Natural Selection
  • Objectives
  • To identify the people who influenced Darwin in
    the development of his ideas
  • To explain Darwins theories of evolution by
    natural selection
  • To discuss descent with modification

2
Darwins Ideas Influenced by
  • Lamarcks Theory of Evolution
  • Voyage on the Beagle (1831-1836)

3
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4
Lava lizard
Swimming Lizard
5
Land Iguana - Galapagos
Marine Iguana - Galapagos
Green Iguana S. America
6
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7
Influences on Darwin
8
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

9
TIME was very important to Darwins theory
  • Hutton Lyell provided the evidence that Earth
    was old enough for evolution to occur

10
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

11
Artificial Selection
  • Breeders select best traits to produce next
    generation

12
Darwins Theory of Evolution by Natural Selection
  • Over time, the number of individuals that carry
    advantageous traits will increase in a
    population
  • Occurs in 4 steps

13
Darwins Theory of Evolution by Natural Selection
  • Living things overproduce

14
Darwins Theory of Evolution by Natural Selection
  • There is variation among offspring

15
Darwins Theory of Evolution by Natural Selection
  • There is a struggle to survive

16
Darwins Theory of Evolution by Natural Selection
  • Those that survive are most fit

17
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

18
Adaptation
19
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

20
1965
1975
FORD MUSTANG
2005
1985
1995
21
Descent with Modification
  • Implies that all living things are related to one
    another
  • COMMON ANCESTOR
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