10 1 early ideas about evolution
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10.1 Early Ideas About Evolution. What is evolution?. Evolution is the process of biological change by which descendants come to differ from their ancestors. Evolution is a central theme in all fields of biology today. Charles Darwin.

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Presentation Transcript
what is evolution
What is evolution?
  • Evolution is the process of biological change by which descendants come to differ from their ancestors.
  • Evolution is a central theme in all fields of biology today.
charles darwin
Charles Darwin
  • Natural selection was the theory he proposed to explain evolution.
    • He attempted to provide reasons for the biological diversity on Earth.
  • However, Darwin was not the first scientist to study evolution.
4 scientists before darwin
4 Scientists before Darwin…
  • Carolus Linnaeus
  • Georges Buffon
  • Erasmus Darwin
  • Jean-Baptiste Lamarck
carolus linnaeus
Carolus Linnaeus
  • In the 1700s, he developed a classification system to help organize all types of organisms into categories based on their similarities.
    • Scientists still use his classification system today.
georges buffon
Georges Buffon
  • He proposed that species shared ancestors rather than arising separately.
    • Species is a group of organisms so similar to one another that they can reproduce and have fertile offspring.
erasmus darwin
Erasmus Darwin
  • Charles Darwin’s grandfather
  • Proposed that all living things were descended from a common ancestor and that more-complex forms developed from less-complex forms
jean baptiste lamarck
Jean-Baptiste Lamarck
  • He believed that species evolved into different forms rather than becoming extinct…flawed idea!
jean baptiste lamarck1
Jean-Baptiste Lamarck
  • He proposed the idea of inheritance of acquired characteristics:
    • changes in an environment caused an organism’s behavior to change
    • this would lead to greater use or disuse of a structure or organ.
    • the structure would become larger or smaller and would then be passed down to offspring
      • For example: giraffes’ long necks
slide13
So….

Darwin based his studies on the work of these four men and developed his theory known as evolution by natural selection.

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