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(Evolution (chemosynthesis` (had no limits (lack of molecular oxygen),…
Evolution
chemosynthesis`
energy sources
had no limits
lack of molecular oxygen
time available fro origin of life
chemicals present in atmosphere
reduction atmosphere
early second atmosphere
lack of molecular oxygen
presence of powerful reducing agents
second atmosphere
hydrogen is a light gas
first atmosphere was lost in space
replaced by second atmosphere
species today evolved from the past species
hypothesis of the origin of life on earth
Barriers
adaptive radiation
found individuals
offspring resemble
first gene pool small
divergent evolution
species rapidly diverge into many species
biological reproductive barriers
sympatric speciation
new species evolve from a single ancestral species
same geographic region
biological phenomenon
prevents gene flow
biological reproductive barriers
physical, non-living feature
prevents two populations from exchanging gens
allopatric/geographic speciation
original species physically divide
can't interbreed
convergent evolution
two distinct, unrelated species
occupy same or similar habitats
natural selection may favor same phenotype
Speciation
phyletic speciation
gene flow
pollen transfer
full haploid genom
alleles are present in pollen grains
movement of alleles
occurs in many ways
vegetative propagation
genetically identical to parent plant
asexual reproduction
multicellular structures
detached from parent plant
seed dispersal
overlooked seed
alleles transferred
new plant produces
long distance dispersal
Divergent speciation
dene flow doesn't keep homogeneous species
two separate species evolve
different from common ancestor
fundamental ways of speciation
phyletic speciations
species gradually change
considered a new species
divergent speciation
populations of species evolves
populations continue unchanged
or evolve into 3rd species
natural selection
new species evolve
Population Genetics
factors that cause gene pool change
accidents
organism can't adapt
mutations
population size
decreases existing alleles
new alleles increase
artificial selection
alter alleles frequency of gene pool
produce ornamental plants & flowers
selective breeding
crops & domestic animals
natural selection
most adaptive survive
most significant factor
factors not apart of natural selection
decision making
purpose
intention planning
conditions before natural selection
differential survival
produce more offspring
to survive and grow
pony must differ in alleles
gene pool
total # of alleles
abundance of different alleles
