Microevolution
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Microevolution, broadly defined, is the inevitable small-scale changes in allele frequencies in a population within the same species. Under this broad definition, this change in overall allele frequencies occurs with every birth or death of a member of the species.
Microevolution, narrowly defined, is the theory that natural selection can, over time, increase the overall reproductive fitness of a species. [1]
Sources:
- ↑ Evolutionists express their theory of "microevolutionary theory that natural selection should optimize the existing genetic variation in a population to maximize reproductive success." http://www.talkorigins.org/faqs/faq-intro-to-biology.html