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EvolutionThere are many mechanisms that lead to evolutionary change One of themost important mechanism in evolution is natural selection which is thedifferential success in the reproduction of different phenotypes resulting from theinteraction of organisms with their environment Natural selection occurs when aenvironment makes a individual adapt to that certain environment by variationsthat arise by mutation and genetic recombination Also it favors certain traits in aindividual than other traits so that these favored traits will be presented in thenext generation Another mechanism of evolution is genetic drift Genetic drift isa random change in a small gene pool due to sampling errors in propagation ofalleles or chance Genetic drift depends greatly on the size of the gene pool Ifthe gene pool is large the better it will represent the gene pool of the previousgeneration If it is small its gene pool may not be accurately represented in thenext generation due to sampling error Genetic drift usually occurs in smallpopulations that contain less than 100 individuals but in large populations driftmay have no significant effect on the population Another mechanism is geneflow which is when a population may gain or lose alleles by the migration offertile individuals between populations This may cause the allele frequencies ina gene pool to change and allow the organism to evolve The most obviousmechanism would have to be mutation that arises in the gene pool of apopulation or individual It is also the original source of the genetic variation thatserves as raw material for natural selectionNot only are there mechanisms of evolution but there is also evidence toprove that these mechanisms are valid and have helped create the geneticvariety of species that exists today Antibiotic resistance in bacteria is oneexample of evolutionary evidence In the 1950s Japanese physicians realizedthat a antibiotic given to patients who had a infection that caused severediarrhea was not responding Many years later scientists found out that acertain strain of bacteria called Shigella contained the specific gene thatconferred antibiotic
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