First Hour Exam
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Transcript of First Hour Exam
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First Hour Exam
Average: 79.8Range: 38 - 99
Answer Sheet tells which ones you missed but doesn’t calculate your grade
See the website to see your grade
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Evolution
http://life.uiuc.edu/animalbiology/105/ID: eee105Password: prAIRie
Lec 13 13Feb02
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Natural selection
N
0 100a characteristic
selection
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Antibiotic resistance in disease bacteria
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Insecticide resistance
disease vectors
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
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Insecticide resistance
disease vectors
agricultural pests
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Pests evolve pesticide resistance
r-strategists evolve most rapidly
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Genetic variation is “raw material”
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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Genetic variation is “raw material”
Environment “edits” the population
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natural selectionnatural selection continuous competitioncontinuous competition
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Natural selectionNatural selection
continuous competitioncontinuous competition between membersbetween members of the same speciesof the same species
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Natural selection
continuous competition between members of the same species
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Natural selection
N
0 100a characteristic
selection
Selection forces ?
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Selection forces
Natural selection
Physical environmental factorse.g weather
Density-independent limiting factorsPhysical environmental factorsPhysical environmental factors
e.g weathere.g weather
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Selection forces
Natural selection
Physical environmental factorsDensity-independent limiting factors
Density-dependent limiting factors disease predation
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Food chain
E
producer primary secondaryconsumer consumer
autotroph herbivore predator
respiration
decomposition
parasites
parasites
parasites
each trophic level regulates population of its preyeach trophic level regulates population of its prey each trophic level selects its preyeach trophic level selects its prey
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Selection forces
Natural selection
Physical environmental factorsDensity-independent limiting factors
Density-dependent limiting factors disease predation competition between species
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Competition between speciesCompetition between species
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pests vs. uspests vs. usCompetition between speciesCompetition between species
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Competition between speciesCompetition between species
weeds vs. usweeds vs. us
pests vs. uspests vs. us
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Selection forces
Natural selection
Physical environmental factorsDensity-independent limiting factors
Density-dependent limiting factors disease predation competition between species
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The ecological theaterThe evolutionary drama
An ecosystem
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But, how can “random” processes
design complex structures?
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But, how can “random” processes
design complex structures?
Isn’t this like expecting a bunch of monkeys locked in a room with typewriters to eventually type out Hamlet’s soliloquy?
Actually one monkey with a computer could do it -- if it were arranged like natural selection
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monkey, typing
computer
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that is the question
to be or not to be
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that is the question
to be or not to be
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Evolution by Natural Selection is not random
Selection is non-randomnon-randomnon-random