Microevolution refers to any evolutionary change below the level of species. It also refers to changes in the frequency within a population or a species of its diffrent genes Another thing that it refers to is their effects on the phenotype, of organism that make up that population or species. One way of variation that occurs is when all types of species produce far more offspring that one can survive to adulthood and reproduce. This means that many of those offspring will die without reproduction. Another way that variation occur is when the variation is heritable, that is if it exist in the parents and are passed on to the offspring. types of species vary in many ways. A third way that variation occurs is when some of those is heritable, which is when the variable traits affect an organism's fitness.
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