biology - themes of biology 1011
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Themes of Biology
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Emergence
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Fig. 1-4
The biosphere
Communities
Populations
Organisms
Ecosystems
Organs and organ systems
Cells
Cell
Organelles
Atoms
MoleculesTissues
10 µm
1 µm
50 µm
Emergent Properties, Reductionism, Systems Biology
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DARWIN’S THEORY OF EVOLUTION
Copyright © 2009 Pearson Education, Inc.
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Fig. 1-20
Populationwith variedinherited traits.
Eliminationof individualswith certaintraits.
Reproductionof survivors.
Increasingfrequencyof traits that enhance survival and reproductive success.
4321
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Terminalbud
Lateralbuds
Leaves
Kale
Stem
Brussels sprouts
Cauliflower
Cabbage
Kohlrabi
Wild mustard
Flowerclusters
Flowersand stems
Broccoli
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• Note these important points – Individuals do not evolve: populations evolve– Natural selection can amplify or diminish only heritable
traits; acquired characteristics cannot be passed on to offspring
– Evolution is not goal directed and does not lead to perfection; favorable traits vary as environments change
Darwin proposed natural selection as the mechanism of evolution
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Chromosome with alleleconferring resistanceto pesticide
Additionalapplications willbe less effective, andthe frequency ofresistant insects inthe populationwill grow
Survivors
Pesticide application
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Humerus
Radius
Ulna
Carpals
MetacarpalsPhalanges
Human Cat Whale Bat
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Pharyngealpouches
Post-analtail
Chick embryo Human embryo
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Tetrapod limbs
Amnion
Lungfishes
Feathers
Amphibians
Mammals
Lizardsand snakes
2
Hawks andother birds
Ostriches
Crocodiles
1
3
4
5
6
Am
nio
tes
Tetrap
od
s
Bird
s
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Cells
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1 µm
OrganellesNucleus (contains DNA)
Cytoplasm
Membrane
DNA(no nucleus)
Membrane
Eukaryotic cellProkaryotic cellFig. 1-8
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Order
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Reproduction
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Growth and Development
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Energy Processing
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Energy processing
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Response
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Regulation
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Adaptation
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DNA
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NucleicontainingDNA
Sperm cell
Egg cell
Fertilized eggwith DNA fromboth parents
Embryo’s cells withcopies of inherited DNA
Offspring with traitsinherited fromboth parents
Fig. 1-9
Continuity of life is based on heritable information in the form of DNA
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Diversity of Life
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Domain Bacteria
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Domain Archea
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Domain Eukarya
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