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Population Genetics and Evolution population genetics (Evolution and the…
Population Genetics and Evolution
Evolution and the origin of the Line
Chemicals produced synthetically
reducing atmosphere on top
discharged spark into gases
first experiment test
Aggregation and organization
strong genetics information existed
natural selection cannot occur
possible chemicals evolution of life
aggregates are not postulated
Conditions on Earth before origin of Life
time available for the origin of life
energy source
earth condensed from the gases
complex chemistry in early second atmosphere
exposed to powerful sources
chemicals present in the atmosphere
Oxygen
#
allowed world to rust
evolution of chlorophyll a and photosynthesis
had two profound consequences
Early Metabolism
they are capable of synthesizing the scarce
absorbing all the materials from the ocean
been complex heterotrophs
Presence of Life
gradual compostition
the physics of living and non living composition is identical
dividing the line would be simplistic
Population genetics
Factors that causes gene pool to change
Mutations
all genomes are subjected to genome factor
existing alleles decrease frequency
significants depends on part of population
Natural Selection
population must produce offsprings
the most significant factor
most adapted to the environment to survive
causing gene pool changes
Accidents
many phenomena as quality accidents
collisions of large molecules on earth
organisms cannot adapt
Artificial Selection
gene pool
selective breeding of crop plants
humans proposely changes alleles
The situation where the natural selection does not work
grow rapidly
considered several cases
competition doesnot occur in the habitat
present may be germinated
natural selection can be gained
multiple selection pressures
mutation produces alleles
reduce reproduction
pathogenic functions
loss of individual
Rate of evolution
#
allele position can change rapidly
loss of metabolism
most populations well adapted
evolutionary changes that results in loss of structure
very few mutations produced
Speciation
abiological reproductive barrier
physical non living creatures
physically divided into two or more creatures
allopatric
convergent evovlution
resembles each other strongly
two distinct unrelated species
considered hypothesis
natural selection favor
divergent speciation
two regions are reproductively isolated
gene flows doesnot keep the species
Biological reproduction barrier
#
difference in flower color and shape
prevents successful gene flow
phyletic speciation
vegetative propagation
spread throughout the entire population
seed dispersal
new benificial alleles rise
functional connection
causes
evolutionary function
