Microevolution is a gene frequency change due to the populations. Microevolution is based on the gene frequencies in a population over a geological time period. Microevolution is not as easy to see as other kinds of evolution because it occurs inside the organisms' bodies. Mutation, selections, gene flow, and gene drifts are the different processes due to the microevolution. Population genetics is the branch of biology that provides the mathematical structure for the study of the process of microevolution. The variations occurs when natural selection, artificial selection, or mutation occurs.
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