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Evolution by Natural Selection

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Evolution by Natural Selection Evolution - genetic changes in a species over time usually to allow the organism to better adapt to the environment History ... – PowerPoint PPT presentation

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Title: Evolution by Natural Selection


1
Evolution by Natural Selection
2
Evolution -
  • genetic changes in a species over time usually to
    allow the organism to better adapt to the
    environment

3
History Scientists
4
Charles Darwin (1809 1882)
5
Charles Darwin (1809 1882)
(example birds with different beaks.they ate
different foods)
6
Charles Darwin (1809 1882)
7
Scientists that helped Darwin
8
Thomas Malthus (1766 1834)
  1. economist
  2. reasoned that if human population continued to
    grow unchecked, there would be insufficient
    living space and food for everyone

9
Jean-Baptiste Lamarck (1744 1829)
  • 1. naturalist
  • 2. proposed that by selective use or disuse of
    organs, organisms acquired or lost traits these
    traits could then be passed on to their offspring
  • 3. the first part of his hypothesis was proven
    incorrect but Darwin used the idea for his
    hypothesis of natural selection

10
Charles Lyell (1797 1875)
  • 1. geologist
  • 2. Darwin learned from Lyell that processes that
    affect the Earth also affect the organisms that
    inhabit it

11
Charles Lyell
as you dig deeper into the Earth, the older the
fossils are
12
Alfred Wallace (1823 1913)
  • 1. naturalist
  • he came up with the theory of natural selection
    about the same time as Darwin (actually, he
    didnt publish his book until 1863)
  • he gave Darwin two of his unpublished papers
    to read some suggest that these papers gave
    Darwin the motivation to publish his book quickly
    (before Wallace)

13
Theory of Evolution by Natural Selection
14
Struggle for Existence
members of each species compete regularly to
obtain food, living space, and other necessities
of life
15
Survival of the Fittest
those that are well suited to their environment
are more likely to survive and pass on their
traits
16
Descent with Modification
each species has descended, with changes, from
other species over time
17
(No Transcript)
18
A few definitions
19
Speciation
20
Geographic Isolation
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