Microevoultion is a change in gene frequency within a population. It can also be defined as evolution on a small scale within a single population meaning to narrow our focus down to one branch of the tree of life. However, microevolution means that if an animal or plant produce with another different species, it produes a new bizzare species. For example, if dogs--like poodle and golden retriever are together and have a dog, the dog will be a mix of both when give birth. Maybe perhaps thousands of years later, dogs and cats will start being together and having their own babies; therefore, making their own animal that was probaly never existed in Earth.
The three ways of how variation occurs of microevolution is mutation, genetic drift, and natural selection. All three of these affect the gene frequencies in a population; mutation can randomly mutate one gene to another. Genetic Drift affects the genetic makeup of the population but it is different from natural selection whereas through an entirely random proess. Genetic Drift doesn't work to produce adaptions even though it is a mechanism of evoultion. For instance, beetles can produce differently when it comes to a different or next generation. The last way, natural selection is the process by which traits beome more or less common in a population due to consistent effects upon the survival or reproduction of their bearers. (natural selection from wikipedia; internet)
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