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Chapter 17 Population Genetics and Evolution (Evolution and the Origin of…
Chapter 17 Population Genetics and Evolution
Population Genetics
Factors that cause gene pool to change
Mutation
Artificial Selection
purposefully change allele frequency (human)
Accidents
Meteor Hitting Earth
Natural Selection
Survival of the fittest
When Natural Selection does not operate
Recently Burned Area
Plowed Field
Multiple Selection Pressures
Abundance of different Alleles in a Population :star:
Rates of Evolution
Plants have the capacity to change quickly
However, they are well adapted so they change slowly
Speciation
Phyletic Speciation
1 species becomes so changed, its considered new species :star:
Pollen Transfer
Seed Dispersion
Vegetative Propagation
Divergent Speciation
Some populations of a species evolve, other populations do not :star:
Abiological Reproductive barriers
Biological Reproductive Barriers
Adaptive Radiation
Convergent Evolution
2 unrelated species evolve to the point where they resemble each other :star:
Natural Selection has caused a new species to evolve :star:
Evolution and the Origin of Life
Condition on Earth before the Origin of Life
Chemicals present in atmosphere
No oxygen
Energy sources
UV And Gamma Radiation
Heat
Volcanos
Chemicals produced chemosynthetically
Formation of polymers
Monomers in the ocean had to polymerize
Aggregation and Organization
Aggregation of chemical components into masses
Early Metabolism
Early Aggregates would have developed a metabolic pathway
Being able to synthesize scarce molecules
Oxygen
Chlorophyll a and photosynthesis allowed for O2
Presence of Life
