1. Evidence of Evolution

2. Four clues support the theory of evolution

3. Fossil of a dinosaur with feathers-an ancestor of modern birds
Fossil Evidence
Fossils allow scientists to show how species have changed over time.
Fossil of a dinosaur with feathers-an ancestor of modern birds

4. We can trace animal evolution by looking at how the fossils change.

5. These fossilized human footprints are 3.5 million years old
Types of fossils
Frozen in ice, trapped in amber, petrified, cast and imprint fossils.
These fossilized human footprints are 3.5 million years old

6. What type of rock would most likely have fossils in it?

7. Why aren’t fossils enough evidence?
Heck, this was back before we even had bodies!
Peter Look- we’ve got ancestors!
Finally! Proof of Evolution!

8. 2. Anatomy
Matching or extra/left over body parts support the idea of common ancestors

9. 2. Anatomy
Homologous structures – body parts that are the same or similar in different species

10. 2. Anatomy
Vestigial structures –body parts that are useless or left over from a previous ancestor in which they were useful
Example: Appendix, tailbones, goose bumps and wisdom teeth.

12. 3. Embryology
Many organisms have similar embryos, supporting the idea of common ancestors.

14. 4. Biochemistry
Many organisms contain similar sequences (sections) of DNA.
Small mutations or changes in the DNA eventually lead to the evolution of new species.

15. Humans and chimps have 96% similar DNA.
Chromosome #2 is split into 2 separate chromosomes in chimps, but when combined, they look just like our #2
Humans and chimps have 96% similar DNA.
Chimps have 48 chromosomes compared to human’s 46.

16. Human Fossil Evidence Found
Click for a news story on new human fossils found…

17. Quiz
What are the four pieces of evidence supporting the theory of evolution?
Fossils, Anatomy, Embryology, Biochemistry

18. Quiz What homologous structure do humans share with a cat?
Similar skeletons

19. Quiz Name two vestigial structures that humans have.
Appendix, body hair, tail bones, goose bumps, ear muscles, wisdom teeth, etc.

20. Quiz
What is more closely related: a human and a pig or a human and a fish? Why?
Human and a pig, we share more homologous structures, more DNA in common, and our embryos are more similar.

21. Homework
Use Chapter 6, section 2 (starts on 165) to complete the sentences on your worksheet.