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Population Genetics and Evolution, image, image, image - Coggle Diagram
Population Genetics and Evolution
Population Genetics
Deals with the abundance of different alleles within a population
Gene pool
total number of alleles in all sex cells of all individuals of a population
Artificial Selection
the process in which human purposefully change the allele frequency of a gene pool
Natural Selection
the most significant factor causing gene pool changes
Speciation
the process of natural selection causing new species to evolve
Phyletic Speciation
one species gradually becomes so changed it must be considered a new species
Gene flow
movement of alleles physically through space
Divergent Speciation
some populations of a species evolve into a new second species
Reproductively Isolated
alleles. that do not reach individuals in another part
Abiological Reproductive
Non- living feature that prevents two - populations from exchanging genes
Allopatric or Geographic Speciation
original species is physically divided into 2 or more populations that cannot interbreed
Biological Reproductive Barrier
any phenomenal that prevents successful gene flow
Sympatric Speciation
two groups that become reproductively isolated even though the grow together
Prezygotic Isolation Mechanism
Biological Reproductive barriers that prevent pollen from moving from one plant to another
Postzygotic Internal Isolation Barriers
large number of characteristic alleles that are unique cause the two populations to become distinct and no longer interbreed
Hybrid Sterility
Earliest of postzygotic barriers, when the 2 populations interbreed the produce a seed that is sterile
Hybrid Inviability
the zygote dies in early developmental due to in compatible proteins.
Adaptive Radiation
special case of divergent evolution in which a species rapidly into many new species over a short period of time
Genetic Drift
the rapid and erratic change of gene pool because the population is small
Evolution and the Origin of Life
Chemosynthesis
Most seriously considered hypothesis about the origin of life.
Conditions on Earth Before the Origin of Life
Second Atmosphere
Produced by release of gases from the rock matrix composing Earth and from heavy bombardment
Reducing Atmosphere
lack of molecular oxygen and the presence of powerful reducing agents
Oxidizing Atmosphere
derived from the early second atmosphere by the addition of oxygen
