Essay On Evolution

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flow which is
when a population may gain or lose alleles by the migration of fertile
individuals between populations. This may cause the allele frequencies in a gene
pool to change and allow the organism to evolve. The most obvious mechanism
would have to be mutation that arises in the gene pool of a population or
individual. It is also the original source of the genetic variation that serves
as raw material for natural selection.
Not only are there mechanisms of evolution, but there is also evidence
to prove that these mechanisms are valid and have helped create the genetic
variety of species that exists today. Antibiotic resistance in bacteria is one
example of evolutionary evidence. In the 1950's, Japanese physicians realized
that a antibiotic given to patients who had a infection that caused severe
diarrhea was not responding. Many years later, scientists found out that a
certain strain of bacteria called Shigella contained the specific gene that
conferred antibiotic ...

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