1 / 17

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.

latisha
Télécharger la présentation

Evidence of Evolution Part 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related