1. You’re a big, fine theory, but you need to back that thang up Write in complete sentences! Don’t talk during the Catalyst!  What is a common ancestor?  What is a homologous structure?  Which two parts of all animal embryos are homologous?  What does this tell us about animal evolution?

2. Objectives By the end of today, all SWBAT…  Analyze DNA evidence of evolution  Analyze fossil evidence of evolution

3. Agenda  Catalyst Review  Homework review  DNA evidence for evolution  HUMAN evolution (OMG!!!)  Fossil evidence for evolution  TRANSITIONAL FORM STATIONS! AWESOME!  Exit Question

4. Evidence: an object or connection that tends to prove or disprove something. In science, all theories must be supported with evidence.

5. DNA  Key Point #1:  DNA supports evolution because the more DNA two organisms have in common, the more closely related they are.  All organisms use the same four bases (A, T, G, C) because all organisms evolved from the same original organism!

6. Original species New species shares 98% of DNA with original species New species #2 shares 96% of DNA with original species Original species

7. CRAZY! Humans share:  30% of their DNA sequence with Daffodils  65% of their DNA sequence with Frogs  90% of their DNA sequence with Lemurs  99% of their DNA sequence with Chimpanzees  99.9% of their DNA sequence with other Humans

9. Fossils!  Fossils are the remains or imprints of an organism that lived long ago.  Preserved tissue, shell or skeleton turned into stone, imprints left in the Earth.

10. Comparative Anatomy  Scientists can compare the anatomy of different organisms to figure out how closely they are related.  Anatomy = body structure

11. Fossils  Key Point #2:  Fossils support evolution in 2 different ways. General Trends Transitional Fossils  On the right side of your notes, you should have how all of these provide evidence.

12. General Trends  The further you dig, the further back in time you are traveling.  IMPORTANT:  As you dig further, fossils tend to be of more primitive and simple creatures!

13. PRACTICE!  Which one of these fossils would be older?  Which fossil is more complex?  If B is an ancient ancestor of A, what do you think fossil C would look like? A B C

14. A transitional fossil is the fossil of an organism that has traits in between its ancient ancestors and species that came after it. Transitional Fossils

15. Human Evolution  Homo habilis  H. ergaster  H. erectus  H. heidelbergensis  H. sapiens and H. neanderthalensis

16. Side-by-Side

17. Transitional fossils are evidence for how a particular species has evolved from its recent ancestors.

18. How did fish evolve to become the first amphibians? Transitional fossils show how/when whole groups of organisms came into existence

19. Transitional Fossil Stations  You have 5 minutes at each station.  Take a piece of paper and answer each question in complete sentences.  LEARN LEARN LEARN!

20. Key Point Wrap-Up  Key Point #1: DNA supports evolution because the more DNA two organisms have in common, the more closely related they are.  Key Point #2: Fossils support evolution in 2 different ways.  General Trends  Transitional Fossils

21. Exit Questions  How do transitional fossils provide evidence for evolution?  Species A has 50% of its DNA in common with Species B, and 95% of its DNA in common with Species C.  Which species is A more closely related to?  How do you know? Write in complete sentences! Don’t talk during the Exit Question!