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Chapter 17: Population Genetics and Evolution (Evolution and Origin of…
Chapter 17: Population Genetics and Evolution
Rates of Evolution
loss of structure or metabolism
Complexity
Mutations
Selectively advantageous
Speciation
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Divergent Speciation
Convergent Evolution
Phyletic Speciation
Evolution and Origin of Life
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Formation of Polymers
Aggregation and organization
chemical components into masses
outer layer
fatty acids
inner layer/interior
mostly hydrophobic outside
hydrophilic interior
Chemicals produced chemosynthetically
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Conditions on earth before evolution
second atmosphere
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reducing atmosphere
lack of molecular oxygen
powerful reducing agents
energy sources
heat
electricity
volcanoes
time available
no limits
Population Genetics
Where natural selection does not work
survival is universal
Multiple selection pressures
drought
cold
pathogenic fungus
insect attacks
need for pollinators
Factors that cause gene pools to change
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artificial selection
human interference
accidents
organisms cannot adapt
mutation
old alleles decrease, increase in new alleles
natural selection
most significant factor
Evolution and Origin of Life cont'd
The presence of life
chemosynthetic theory
inorganic compounds to living bacteria
Early Metabolism
aggregates consume certain nutrients
scarcity
strong selective advantage
rapid metabolism
Oxygen
oxidizing atmosphere
derived from early second atmosphere
period of rusting
important
conc. of free oxygen low
