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Population Genetics and Evolution (Speciation (Phyletic Speciation…
Population Genetics and Evolution
Population genetics
Multiple selection pressures
Mutation produce allele
loss of individuals
pathogenic fungus
reduce reproduction
Cold hardiness allele affect plants
new allele happens in cold weather
Factor gene pool to change
Artificial selection
Gene Pool
Domestic animals
change allele frequency
breeding of crop plants
Accidents
Size strikes earth
organisms cannot adapt
collision of large molecules
phenomena qualify as accidents
Mutation
alleles decreases frequency
genomes mutagenic factor
mutations occurs
depends in part of populations
Natural Selection
progeny
most significant factor
gene pool changes
produce offspring
Most adapted
not part of natural selection
Clearly and accurately
no purpose and intension
plant have disease - resistance gene
fungus affects
Natural selection does not operate
Grow vigorously
competition does not occur
considered several cases
natural selection gained
population identically gentically
May germinated
Speciation
Discriminating pollination occur
prevents successful gene flow
difference in flower, color, shape
Phyletic Speciation
Vegetative propagation
reproduce vegetatively
species produce
Seed dispersal
Dispersal mechanism
plants fall close
Spread throughout the population
Millions of years required
new beneficial alleles
one full haploid genomes
present in pollen grains
wind distributed pollen
animal mediated pollination
Divergent speciation
gene does not keep the species
Reproductively isolated
may occur
Abiological reproductive barrier
physical, non living features
divided into two or more population
exchanging gene
allopatric
Convergent Evolution
two distinct species
considered hypothesis
resemble strongly
undergone convergent evolution
natural selection
Rates of evolution
#
loss of structure
few mutation produce
allele position change
well adapted population
loss of metabolism
New phenotype superior
Early Metabolism
#
Synthesizing scarce
modify few molecules
absorption
complete heterotrops
Formation of polymers
Mechanism produce
absorption by clay particles
monomers presents
requires high concentration of monomers
concentrated monomers
Before the origin
energy sources
earth condensed from gases
chemical present in air
intense UV and gamma radiation
Time available
Chemicals produce Chemosyhthetically
Reduce atmosphere on top
1st experimental test
Chemosynthetic hypothesis were performed
discharge spark into gases
Aggregation and organization
chemical evolution of life
aggregation of chemical component
natural selection cannot occur
aggregates are not postulated
The presence of life
#
gradual composition
dividing line would be simplistic
living and nonliving is identical
Oxygen
two profound consequences
evolution of chrophyll and photosynthesis
allowed world to rust
#
Mechanical connection
Functional Connection
Inter functional Connection
Cause Connection
