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Population Genetics and Evolution (Evolution and the Origin of life…
Population Genetics and Evolution
Population Genetics
Factors that cause the gene pool to change
mutation
genomes
existing alleles
decrease frequency
new alleles
increase frequency
population size
accidents
organisms cannot adapt
artificial selection
humans change alleles
selective breeding
Natural selection
most significant
survival of the fittest
more adapted
survive
less adapted
do not survive
Factors that are not part of natural selection
does not include
intention
planning
purpose
voluntary decision making
Speciation
Phyletic Speciation
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Pollen transfer
one haploid genome
alleles present
travel great distances
rapid allele movement
Seed dispersal
dispersal mechanisms
wind
floods
stream flow
stick to fur
Vegetative Propagation
Divergent Speciation
Abiological Reproductive Barriers
physical, nonliving feature
:red_cross:gene exchanging
cannot interbreed
allopatric
geographic speciation
Biological Reproductive Barriers
:red_cross:successful gene flow
effective barriers
flower color
shape
fragrance
sympatric speciation
prezygotic isolation mechanisms
postzygotic internal isolation barriers
hybrid sterility
hybrid inviability
Adaptive Radiation
founder
Convergent Evolution
Evolution and the Origin of life
Conditions on Earth Before the Origin of life
Chemicals Present in the Atmosphere
second atmosphere
reducing atmosphere
Energy sources
Gamma radiation
UV radiation
Time Available for the Origin of Life
No limits
lack of free oxygen
Chemicals Produced Chemosynthetically
Formation of Polymers
Aggregation and Organization
Early Metabolism
Oxygen
Presence of Life
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