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Happy Tuesday!

Happy Tuesday!. Lets do a Quickwrite 1. List the 5 requirements for Natural Selection to occur. Over production Variation Struggle to survive Survival of fittest Populations evolve. Evidence Supporting Evolution. E ven V ery G ood F riends H iccup

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Happy Tuesday!

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  1. Happy Tuesday! • Lets do a Quickwrite • 1. List the 5 requirements for Natural Selection to occur.

  2. Over production • Variation • Struggle to survive • Survival of fittest • Populations evolve

  3. Evidence Supporting Evolution Even Very Good Friends Hiccup Embryonic, Vestigial, Genetics, Fossils, Homologous structures

  4. 1. Embryonic Similarites • The same groups of cells develop in the same order and in similar patterns in all vertebrates. • The more alike the embryo stages are, the more closely related the organisms are thought to be. • Examples: Turtles, chickens, rabbits, and humans all appear similar as embryos!

  5. 1. Embryonic Similarities

  6. 2. Vestigial Structures • Structures in organisms left over from ancestors that have no known functions. • Examples: • Leg bones in skinks • Appendix in humans • Tailbone in humans

  7. Legless Skink

  8. 3. Comparative Anatomy • The study of the structures of different organisms

  9. Homologous Structures • Anatomy that is similar in structure and origin • Not always similar in function • This shows an evolutionary relationship • Examples: Fore-limbs of whales, birds, cats, and humans have similar bone structures

  10. Homologous Structures

  11. Analogous Structures • Structures that perform the same function but have different anatomy • This shows NO EVOLUTIONARY RELATIONSHIP • Example: The wings of birds and butterflies

  12. Analogous Structures

  13. 4. Fossil Record • Shows extinct species that have similar structures to those alive today • Includes hundreds of transitional fossils that demonstrate intermediate stages in evolution • Examples • Giant armadillos and sloths • Cephalopods

  14. Giant Armadillo and Sloth

  15. How did this whole thing happen? • Pangea • The idea that our earth was once one huge planet that split apart and became the 7 continents we know today.

  16. 5. Genetic Similarities(Biochemical Homology) • Related organisms have closely related DNA sequences and amino acid sequences • This comparison tends to be more reliable than anatomical studies • Examples: Human and chimpanzee DNA are 98% similar

  17. Genetic Similarities

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