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Evidences for Evolution

Evidences for Evolution. What is evolution?. The change in the inherited characteristics of biological populations over time. Idea #1: Tree thinking. Darwin uses trees as a metaphor for pattern of evolution. Hierarchical Growing Expansion/die-offs Single common ancestor (trunk).

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Evidences for Evolution

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  1. Evidences for Evolution

  2. What is evolution? • The change in the inherited • characteristics of biological • populations over time.

  3. Idea #1: Tree thinking • Darwin uses trees • as a metaphor for • pattern of evolution. • Hierarchical • Growing • Expansion/die-offs • Single common ancestor (trunk)

  4. Idea #2: Natural Selection • The most reproductively successful individuals pass their traits to the next generation.

  5. Idea #2: Natural Selection

  6. Evolution elsewhere • Automotive evolution

  7. Evolution elsewhere • Linguistic evolution Whan that Aprill with his shouressoote The droughte of March hath perced to the roote Chaucer, Canterbury Tales, Prologue ~1387

  8. Evolution elsewhere • Geologic evolution

  9. Evidence #1: the fossil record

  10. 1 2 3 4 What is the evolutionary progression of these fossils? Number from oldest to youngest. Explain your reasoning!

  11. 1 2 3 4 Fossil record provides snapshots of the past that can be assembled to illustrate a pattern of evolutionary change over the last 4 billion years.

  12. Evidence #2: chromosomal recombination

  13. Humans and chimps are 99% similar genetically. But humans have 23 pairs of chromosomes and chimpanzees have 24 pairs. How can our chromosome pairs be different when we share almost all the same genes? • http://www.pbs.org/wgbh/evolution/library/07/3/l_073_47.html #24

  14. Evidence #3: Embryology

  15. ? ? ? ? ?

  16. 5 4 3 1 2 What features make these embryos look so similar? Can you identify their species? chicken, fish, human, rabbit, salamander

  17. Evidence #4: Homologous structures

  18. The shading in these drawings indicates what significant fact about vertebrate forearms despite their extreme differences in function and appearance?

  19. ALL VERTEBRATE LIMBS ARE ASSEMBLED THIS WAY REGARDLESS OF THEIR USE!

  20. Analogous structures • Bat wings have bones, insect wings do not • Evolved separately and not evidence of a common ancestor

  21. Evidence #5: Vestigial structures

  22. Humans can have their appendix removed and still live a normal life. Where does the appendix come from if it’s non-essential?

  23. Vestigial structures - SciShow

  24. Quick Recap • Geologic/fossil records • Chromosomal data • Embryology • Homologous and • Vestigial structures

  25. Questions?

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