15.1 Charles Darwin and Natural Selection - PowerPoint PPT Presentation

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15.1 Charles Darwin and Natural Selection

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15.1 Charles Darwin and Natural Selection Charles Darwin and Natural Selection Evolution is change in populations over time Fossils and Evolution Looking at fossils ... – PowerPoint PPT presentation

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Title: 15.1 Charles Darwin and Natural Selection


1
15.1 Charles Darwin and Natural Selection
2
Charles Darwin and Natural Selection
  • Evolution is change in populations over time

3
Fossils and Evolution
  • Looking at fossils, we see that life changes over
    time, or evolves

4
Darwin on HMS Beagle
  • 5 year journey as naturalist to South America and
    South Pacific, 1831
  • Studied and collected biological specimens

5
Darwin on HMS Beagle
  • On the Galapagos Islands Darwin saw many species
    unique to the island but similar to species on
    mainland
  • He thought species changed over time

6
Darwin on HMS Beagle
  • For the next 22 years he worked to explain the
    change
  • Thomas Malthus said human population grows faster
    than Earths food supply
  • This made Darwin think there will be a struggle
    to survive

7
Darwin on HMS Beagle
  • Maybe animals struggle
  • Compete for food and space
  • To escape predators
  • To find shelter and mates
  • Maybe some survive, others dont

8
Natural Selection
  • Artificial selection When we breed organisms
    with specific traits because we want to produce
    offspring with those traits
  • Darwin thought something in nature might work the
    same way if organisms with certain traits survive
    better than others

9
Natural Selection
  • Natural Selection when organisms with certain
    variations survive and reproduce
  • Causes change in populations

10
Evidence for Evolution
  • Scientific data collected since Darwins time
    supports evolution
  • Change in the gene pool of a population
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