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Evidence of Evolution Part 2

Evidence of Evolution Part 2. Evidence of Evolution. In addition to fossils, other evidence supports the theory of evolution Comparative anatomy: study of the structures of different organisms Remember, a theory in science means: The idea has been tested repeatedly and so far not disproven.

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Evidence of Evolution Part 2

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  1. Evidence of Evolution Part 2

  2. Evidence of Evolution • In addition to fossils, other evidence supports the theory of evolution • Comparative anatomy: study of the structures of different organisms • Remember, a theory in science means: • The idea has been tested repeatedly and so far not disproven

  3. Homologous Structures • Homologous structures: body parts similar in origin and structure • Homologous: from the ancient Greek meaning “to agree” • Homologous structures developed from the same body part in a common ancestor • Homologous structures are the result of divergent evolution

  4. Homologous Structures • From http://itc.gsw.edu/faculty/bcarter/histgeol/paleo2/homol1.htm and Monroe and Wicander, The Changing Earth, 3rd Edition

  5. Homologous Structures • Not necessarily similar in function • Homologous structures indicate organisms are related (have a common ancestor) • The greater the number of homologous structures, the more closely related

  6. Homologous Structures • Homologous structures the result of having the same structural genes • Structural genes control the presence of a particular part

  7. Homologous Structures • Regulatory genes control the shape and form of the structures made by structural genes • When the structure begins growth • Rate of growth • When the structure stops growing

  8. Homologous Structures • From http://itc.gsw.edu/faculty/bcarter/histgeol/paleo2/homol1b.htm

  9. Vestigial Structures • Suppose a structure becomes unnecessary—the genes making it don’t just disappear • Vestigial structures: structures an organism has that are like those another organism has, but which are not used • Vestigial structures indicate similarities and common ancestors in organisms because they are created by similar structural genes

  10. Vestigial Structures • Examples of vestigial structures: • Flightless birds have wings

  11. Vestigial Structures

  12. Vestigial Structures • Examples of vestigial structures: • Hind leg bones in whales • Human tail bone (coccyx) • Human appendix • Pig toes (the little ones)

  13. Vestigial Structures

  14. Vestigial Structures

  15. Vestigial Structures

  16. Vestigial Structures • http://www.hsu.edu/content.aspx?id=5290

  17. Vestigial Structures

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