ROBERTS Download 14

ROBERTS Download 14 - Download 14 Intro to Evolution &...

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Download 14 Natural Selection Principles of Biology BIOL 1543 Greig Roberts, DDS Office: SCEN 417 E-Mail: groberts@uark.edu
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2 Darwin’s main ideas can be traced back to the ancient Greeks. Aristotle and the early Judeo-Christian culture believed that species were fixed, but there were exceptions. In the century prior to Darwin, the study of fossils suggested that life forms change. Geologists eventually proposed that a very old Earth is changed by gradual processes. 0 Evolutionary thought has a long history
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3 While on the HMS Beagle in the 1830s, Charles Darwin observed living and fossil organisms and the diversity of life on the Galápagos Islands, helping frame his idea of evolution.
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Darwin proposed natural selection as the mechanism of evolution Darwin observed that organisms: 1) Produce more offspring than the environment can support 2) Vary in many characteristics that can be inherited Darwin reasoned that natural selection leads to favored traits being represented more and unfavored traits less in future generations of organisms. Actually a very simply idea!
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ROBERTS Download 14 - Download 14 Intro to Evolution &...

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