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Chapter 17: Population Genetics & Evolution (Population Genetics…
Chapter 17: Population Genetics & Evolution
Population Genetics
deals with the abundance of different alleles in a population
factors that cause genes to change
mutation
change in alleles
natural selection
survival of the fittest
certain traits allow organisms to survive and pass on genes
artificial selection
selectively breeding organisms with desired traits
changes the allele frequency in populations
natural vs artificial selection
Evolution and the origin of Life
rejects divine intervention
earth conditions before origin of life
toxic chemicals in atmosphere
first life forms had to be able to synthesize these chemicals
energy sources
gamma and UV rays from sun
Speciation
two ways
divergent speciation
some populations of species evolve into a new one
abiological reproductive barriers
physical nonliving factors that prevents two populations to share genes
biological reproductive barrier
a biological phenomenon that prevents gene flow with in a population or populations
adaptive radiation
species rapidly diverges into many new species over a short time
phyletic speciation
one species gradually become changed to where it becomes a new species
gene flow
movement of alleles through population
pollen transfer
pollen grains each carry one full haploid genome
vegetation propagation
species produces small, mobile piece that reproduce vegetatively
seed dispersal
some fall close to parent
many travel long distances
