The first force of evolution is mutation which is something that we cannot control, it just happens by chance and it also effects the patient on a chromosomal level so the mutation passes on to offspring. The second force of evolution is gene flow which is basically a difference in the genes of 2 different groups of the same species that have slight differences in their genetic makeup because of their environment. The third force of evolution is genetic drift which, like mutation, occurs randomly and it is the percentage that an allele will change from one generation to the next. The final force of evolution is natural selection which is probably the most known force, it is natures way of getting rid of bad genes by killing them off.
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