Bio 201 F07 True lect 3 post

Bio 201 F07 True lect 3 post - Observation: Adaptations are...

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Observation: Adaptations are often exquisite • It is often hard to conceive how such complexity evolved in a gradual or stepwise manner.
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Mimetica incisa (Orthoptera, Tettigoniidae) Adaptations of life forms: mimicry
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Adaptations of life forms: mimicry Structures in some Passionflower species closely resemble eggs of Heliconius butterflies.
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How do these adaptations arise? Adaptations of life forms: mimicry Later mimicking a larva?
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Broccoli Cauliflower Cabbage Brussels sprouts Kohlrabi Wild Mustard Clues from Artificial Selection
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Darwin kept and bred pigeon varieties. All of these were derived from the ancestral rock pigeon. Clues from Artificial Selection
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Brussels sprouts Wild Mustard …and, several generations of selection later…. time Clues from Artificial Selection Bud size (cm)
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Inference 1 More offspring produced than can survive Natural selection one long argument Inference 2 Individuals with traits that confer advantage are more likely survive to reproduce Inference 3 If the favorable traits are heritable, evolution of the population occurs.
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Natural Selection Observation 1 Organisms have great potential fertility (high reproductive potential )
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Exponential Growth Time ONE Escherichia coli bacterium, under optimal conditions in which cell divisions take place every 20 minutes, should have descendents that cover the Earth in a layer 1 foot deep in about 36 hours -E.R. Pianka ( http://www.zo.utexas.edu/courses/THOC/exponential.growth.html)
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More offspring produced than can survive Natural Selection Inference 1 “struggle for existence” -(not necessarily direct struggle with other population members)
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Most natural populations normally remain fairly constant in size (number of individuals) Natural Selection Observation 2
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Inference 1a Observation 1 Organisms have great potential fertility Observation 2 Natural populations
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Bio 201 F07 True lect 3 post - Observation: Adaptations are...

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