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Evidence of Evolution

Essential Question: What data do scientists use to support the theory of evolution?. Evidence of Evolution. Vocabulary. Fossil Evidence Homologous Structures Analogous Structures Vestigial Organs Embryology Genetic Evidence Distribution. Concepts. Fossil evidence Genetic information

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Evidence of Evolution

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  1. Essential Question: What data do scientists use to support the theory of evolution? Evidence of Evolution

  2. Vocabulary • Fossil Evidence • Homologous Structures • Analogous Structures • Vestigial Organs • Embryology • Genetic Evidence • Distribution

  3. Concepts • Fossil evidence • Genetic information • Studying different species

  4. Fossil Evidence • Related fossils in different rock layers can show how organisms changed over time. • Example: whales could have descended from land animals related to deer & hippos, by adapting to live in the water.

  5. …More Fossil Evidence • Scientists also believe fossil evidence shows a relationship between birds and dinosaurs, by studying a group of dinosaurs known as theropods.

  6. Fossil Evidence Video • http://www.youtube.com/watch?v=GOKW_7KajCU

  7. Homologous Structures • Body parts of organisms that have….. • Similar structure, but • Not same purpose. • Indicate that organisms have evolved from a common ancestor.

  8. Homologous Structures • Example: human arm, bird wing, whale flipper – composed of similar bones, but used for a different purpose.

  9. Analogous Structures • Body parts that have a….. • Similar function, but • Different structure. • Shows evidence of separate evolution, not from a common ancestor. • Example: Bat wing, bird wing, insect wing.

  10. Vestigial Organs • Body parts that do not seem to play any role in the function of an organism. • Example: human appendix, pelvic bone in whale. • Can also be evidence of common ancestry.

  11. Embryology • The study of embryos(early stage in development of organism). • Embryos of related organisms develop in similar ways. • Could suggest a common ancestor.

  12. Video! • http://www.learn360.com/ShowVideo.aspx?SearchText=homologous&lid=18565884&ID=146630

  13. Genetic Evidence • Scientists study DNA for evidence of evolution. • The more similarities in DNA, the more recently the species evolved from a common ancestor.

  14. Distribution • The places where related species are found. • When organisms migrate to new environments, they may adapt and evolve into new species. • Example: plants & animals of the Galapagos Islands; finches adapting to each island.

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