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CH 17 POPULATION GENETICS & EVOLUTION (Origin of Life (Earth…
CH 17 POPULATION GENETICS & EVOLUTION
Population genetics
situations where natural selection doesn't occur
if its impossible to adapt to certain condition
if all individuals are identical genetically
if survival is universal
multiple selection pressure
if something else kills out the allele before it can perform its adaptation
Gene Pool Change factors
Artificial Selection
Accidents
Mutation
Natural Selection
survival of the fittest
genetics of groups of individuals on 1 species
abundance of different alleles within population
Speciation
Divergent
Biological
differences in flower color or smell
Abiological
mountain barriers for pollen carriers
when reproduction is prevented
Convergent
when phenotypes evolve & look alike but genotypes are still not same
Phyletic
through pollen transfer, seed dispersal, or mobile vegetative
when natural selection causes new species to evolve
Origin of Life
Earth Conditions before
chemicals were present
different energy sources
Chemicals produced
Polymer formation
OXYGEN
oxidizing atmosphere
derived from oxygen that was added in photosynthesis
Aggregation
Early Metabolism
Evolution
gradual conversion of one species into one or several
Gene Pool
total # of alleles in all sex cells of individuals in population
Artificial Selection
humans purposefully change allele frequency of gene pool
