It’s changes in gene frequency within a population.

Microevolution occurs when there are changes in frequency within a population over a short period of time. Microevolution specifically refers to changes within a population, a population being a group of organisms that breed with each other.

Microevolution differs from macroevolution in scale. Macroevolution occurs in a large scale: when we’re talking about evolution beyond the species scale, we’re talking about macroevolution. The mechanisms of the micro and macroevolution are the same: , , gene flow, and .

To learn more, check out this excellent resource from Understanding Evolution.


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