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Biology

Biology. Unit 4 – Continuity and Change Outcome 2. Key Knowledge areas.

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Biology

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  1. Biology Unit 4 – Continuity and Change Outcome 2

  2. Key Knowledge areas • geological time: scale; relative and actual dating techniques; • evidence of evolution: fossil record, biogeography, comparative anatomy; molecular evidence; • patterns of evolution: divergent, convergent; allopatric speciation, extinction; Abundance of online resources for Biological Evolution herehttp://learningscience.org/lsc3cevolution.htm

  3. Start thinking on geological timescale • Cockroaches have been around for 280,000,000 years • Been in existence before dinosaurs (250-65MYA)

  4. Geological time scale

  5. Geological time scale Race track analogy A brief history of lifehttp://www.pbs.org/wgbh/nova/evolution/brief-history-life.html

  6. Graphic organizer

  7. Geological time scale ‘Relative’ knowl- ‘AGE’ of key area • Organizer represents relative ages of rock. • Earliest key knowledge recorded in lowest layer ‘C’ first • Fill up organizer as more knowledge is stacked on top. • ‘E’ - Could include a ‘fault’ fact in a lesson prompting students to spot the faulteg. …Humans caused the extinction of the dinosaurs…

  8. WAIT! Where is the hook…… • HOLIDAY PHOTOS!!!! YouTube video • Symphony of Science – World of the Dinosaur (Annoying) Mega fauna video • Enormous beasts that were once in our back yard

  9. Geological time scale Key knowledge area – Relative and Absolute dating techniques Relative • Rock layers ‘Strata’ inferring older layers are found in deeper sediment • Graphic organizer example Absolute • Uses radiometric means. • Dating elements in minerals of rocks • Releasing energy (radioactive decay) • Each radioactive atom has a half life

  10. Geological time scale Commonly used isotopes Parent Uranium 238Uranium 235Potassium 40Rubidium Daughter Lead 206Lead 207Argon 40Strontium Half life 4,510 m.y 713 m.y 1,300 m.y 47,000 m.y Carbon 14 used for fossils containing organic matter up to 40,000 years old. Daughter state is Nitrogen 14Carbon 14 half life is 5,730

  11. Geological time scale http://www.neok12.com/php/watch.php?v=zX0051590058424f5e647a63&t=Fossils Watch in class or ‘Flipped’ classroom

  12. Play a game… • Half Life • or……

  13. Geological time scale Half Life Radioactive Dating Game • Includes questionnaire

  14. Geological time scale

  15. Radioactive dating - isotopes - half life -decay Relative dating Geographic time scale

  16. Next key knowledge area – ‘evidence of evolution’ • Fossils - Discuss formation of fossils ’Fossilator App’ Using real fossils from a fossil kit, use the app to investigate ancestral organisms by distinguished features Further in the unit –Hominid evolution and comparative anatomyhttp://www.eskeletons.org/

  17. Evidence for evolution- fossil records -comparative anatomy/biochemistry Convergent evolutionDivergent evolution Allopatric speciation Radioactive dating - isotopes - half life -decay Formation of fossils Relative dating Geographic time scale

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