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5.1: EVIDENCE FOR EVOLUTION
Understandings
• Evolution occurs when heritable characteristics of a species change.
• The fossil record provides evidence for evolution.
• Selective breeding of domesticated animals shows that artificial selection can cause evolution.
• Evolution of homologous structures by adaptive radiation explains similarities in structure when there are differences in function.
• Populations of a species can gradually diverge into separate species by evolution.
• Continuous variation across the geographical range of related populations matches the concept of gradual divergence.
Applications and Skills
• A: Development of melanistic insects in polluted areas.• A: Comparison of the
pentadactyl limb of mammal, birds, amphibians, and reptiles with different methods of locomotion.
Charles Darwin1809 - 1882
“……can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight, over others, would have the best chance of surviving and procreating their kind? On the other hand, we may feel sure that any variation in the lease injurious would be rigidly destroyed. This preservation of favourable variations and the rejection of injurious variations, I call NATURAL SELECTION.” – On the Origin of Species
Half-life
Whale evolution: http://www.youtube.com/watch?v=I2C-3PjNGok
The Bizarre Truth About Pure Breeds
http://media.outsideonline.com/images/dog-breeds-now-and-then_fe.jpg
Adaptive Radiation
Transient Polymorphism
TOK
• What are the arguments for and against the peppered moth as an example of evolution?• Should it continue to be used in classrooms as an
example?• When there are disagreeing sides, which one
should we believe?• What have you learned from TOK to help you
make your decision?
• Vocab• Heritable• Speciation• Homologous
structures• Analogous structures• Artificial selection• Adaptive radiation• Niche• Natural selection• Selective pressure
• Pg 222- Challenge Yourself• Pg 228- Exercises
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