Please enable JavaScript.
Coggle requires JavaScript to display documents.
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
existing alleles decrease and new increase
accidents
cannot adapt
artificial selection
purposefully change the allele frequency
natural selection
most significant factor
survival of the fittest
situations in which natural selection does not operate
identical genetically
impossible to adapt
multiple selection pressures
adapting using genetics to further life
fungi resistance is an example
rates of evolution
many organisms have adapted already
evolutionary changes result in loss of structure
speciation
phyletic
species gradually become so changed
have to be considered new species
gene flow
pollen transfer
seed dispersal
vegetative propagation
divergent
evolve into a new
second species while other populations continue unchanged
parentals evolve into third species
Abiological reproductive barriers
biological reproductive barriers
prezygotic isolation
pollination nor fertilization occur
hybrid sterility
convergent evolution
same similar habitats
natural selection may favor the same phenotypes in each
evolution and the origin of life
conditions on earth before the origin of life
chemicals
second atmosphere
release of gases from rock matrix
reducing atmosphere
chemicals produced chemosynthitically
found amino acids
effects of varying atmospheric compositions using energy sources
formation of polymers
high concentrations of monomers
aggregation and organization
fatty, hydrophobic material would accumulate as oil slicks
metabolism
early metabolism
metabolic pathway involving two enzymes
oxygen
chlorophyll a
photosynthesis
liberates oxygen
oxidizing atmosphere
the presence of life
chemosynthetic theory
slow gradual transitions inorganic compounds to living bacteria
