biology unit 4 – continuity and change outcome 2
TRANSCRIPT
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BiologyUnit 4 – Continuity and Change
Outcome 2
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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
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Start thinking on geological timescale
• Cockroaches have been around for 280,000,000 years• Been in existence before dinosaurs (250-65MYA)
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Geological time scale
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Race track analogyGeological time scale
A brief history of lifehttp://www.pbs.org/wgbh/nova/evolution/brief-history-life.html
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Graphic organizer
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‘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…
Geological time scale
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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
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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
Geological time scale
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Commonly used isotopes
Parent
Uranium 238Uranium 235Potassium 40Rubidium
Daughter
Lead 206Lead 207Argon 40Strontium
Half life
4,510 m.y713 m.y1,300 m.y47,000 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
Geological time scale
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http://www.neok12.com/php/watch.php?v=zX0051590058424f5e647a63&t=Fossils
Watch in class or
‘Flipped’ classroom
Geological time scale
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Play a game…• Half Life
• • or……
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Half Life Radioactive Dating Game
• Includes questionnaire
Geological time scale
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Geological time scale
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Geographic time scale
Relative dating
Radioactive dating - isotopes - half life -decay
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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/
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Geographic time scale
Relative dating
Radioactive dating - isotopes - half life -decay
Evidence for evolution- fossil records-comparative anatomy/biochemistry
Convergent evolutionDivergent evolution
Allopatric speciation
Formation of fossils
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