Welcome Back  10/9/2012 DO NOW!

1. Welcome Back  10/9/2012DO NOW! • What happens if an organism does not adapt to meet the needs of its environment? • Explain how embryology supports the theory of evolution. • Our DNA is most similar to ____________. • What the heck is a homologous structure?

2. Agenda • Overview for Thursday • Finish mega exit ticket • Exit ticket catch up • Evolutionary Biology in 40 minutes: • Part I - Extinction • Part II – Classification • Part III – Genetic Diversity

3. Today is our LAST official day of Earth’s History! Congratulations, you are almost ¼ done with 8th grade science!

4. Thursday, 10/11 • Ms. K will be OFF CAMPUS all day    • You will have a SUBSTITUTE    I expect you to be on your absolute best behavior. Bad reports are not an option! You are serving as ambassadors for the entire school. Make a good impression!

5. Thursday, 10/11 • I will leave your assignment (EH study guide) & directions with the sub. • Keep ALL your work, do NOT give it to the sub. • I will check it off and we will go over it on Monday. We have a limited amount of time to study for our unit test – use this time wisely.

6. MEGA EXIT TICKET TIME!!! Remember: This is worth 90 points – almost a full test grade! • Use your notes & each other as resources • Keep the volume level low- you should be able to hear the music at all times. If you can’t, you are too loud. • Pay attention – these questions will be on your quiz! • You have 30 minutes!

7. Hey, Smarties! • Your exit ticket had questions from the AP biology exam  usually taken by 11th and 12thhonor students!!!!! • Students who pass this testreceive college credit!

8. We are still working on… (last day, I promise) LEQ #6 How are Geologic Evolution and Biologic Evolution related to one another?

9. Part I - Let’s talk about extinction. • True or False: Most species that have ever lived on earth are now extinct. • Believe it or not, this is actually TRUE.

10. WHY??? Extinction occurs when the environment changes and species do not have the necessary characteristics to survive.

11. Extinct Species you may (or may not) have heard of… • Quagga (zebra horse, 1880’s) • Saber-toothed cat (10,000 years ago) • Dodo bird (1600’s) • Woolly Mammoth (10,000 years ago)

12. The weirdest extinct species you’ve NEVER heard of… • Flores Man – “The Human Hobbit” • Tiny people (about 3 feet tall) • Discovered in Indonesia in 2003 • Died about 12,000 years ago

13. The Human Hobbit Evolutionary Significance – • Distinct line in human evolution • Flores man overlapped with modern man  did they ever meet??? • Why did modern man survive while Flores Man became extinct?

14. Why did modern man survive while Flores Man became extinct? • The growth and survival of organisms depend on physical conditions. • Characteristics of Flores Man (small body, small brain, flat feet, no chin) were not suitable for modern life.

15. Part II - How many living species are there RIGHT NOW? • Estimates range from 3 million-100 million. • Scientists discover & catalogue 15,000 new species a year.

16. Biological Classification & Taxonomy • A system used to organize life on earth. • Allows scientists to… • Precisely describe organisms • Examine relationships between organisms • Construct evolutionary trees • Ex: The Wooly Mammoth is an ancestor of the elephant.

17. Part III – Genetic Diversity • Quick Review – 7th Grade Style • Genotype: Genetic makeup of a cell • Phenotype: Organism’s observable characteristics  Looks, behavior, etc.

18. We are all UNIQUE. • No 2 organisms have the same DNA sequence (except for identical twins and clones)

19. These differences are important • Genetic Diversity – We need different traits in order to be successful as a species. • Ex: If all people on earth have the L-gene, and a virus kills everyone with that gene, we will become extinct!