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Evidence for Evolution

Evidence for Evolution. Evidence for Evolution. Homology Convergent evolution Vestigial structures Embryology Fossils DNA. Homology– Evidence of a Common Ancestor. Homology– Evidence of a Common Ancestor.

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Evidence for Evolution

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  1. Evidence for Evolution

  2. Evidence for Evolution • Homology • Convergent evolution • Vestigial structures • Embryology • Fossils • DNA

  3. Homology– Evidence of a Common Ancestor

  4. Homology– Evidence of a Common Ancestor • When we see very similar parts in many living things, we gain evidence of their common ancestor and its characteristics.

  5. Convergent Evolution

  6. Convergent Evolution

  7. Convergent Evolution

  8. Convergent Evolution

  9. Convergent Evolution • Most evolution is Divergent (species with similar traits have a common ancestor) • According to Natural Selection, species evolve traits that help them survive in an environment. • Sometimes, the requirements to survive in an environment are so strong that several VERY DIFFERENT SPECIES evolve traits that function in similar ways. This is convergent evolution.

  10. Vestigial Structures

  11. Vestigial Structures

  12. Vestigial Structures

  13. Vestigial Structures

  14. Vestigial Structures

  15. Vestigial Structures • Structures that are no longer useful, such as our appendix,, or the fingers on a whale are vestigial structures. They are evidence that these creatures evolved from other creatures that used these structures.

  16. Embryology

  17. Embryology

  18. Embryology • Embryos of some animals show traits that are not present in adults such as gills and tails in humans. These are evidence that these traits were found in our ancestors.

  19. Fossils

  20. Fossils

  21. Fossils

  22. Fossils

  23. Fossils

  24. Fossils • There are fossils of many creatures that no longer exist today. They often show missing links between species that exist today and their ancestors. • We also see that fossils deeper in the earth only show simpler creatures with more advanced life forms closer to the surface.

  25. DNA Similarities

  26. DNA Similarities • If you look at the DNA of living creatures you can see the similarities. • Many sections of DNA are don’t code foe anything at all. These sections are similar to working or useful sections in other creatures. • Even in human DNA, you can see the broken parts of code that were important in an organism long ago

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