Microevolution is small-scale genetic changes that lead to new subspecies. Microevolution ocurs from mutation, migration, and selection. Mutation is when there are random changes in the organism's composition or number of DNA molecules in their cell. Selection is when "weak alleles" that hurt the chances of an organism's survival are eliminated from the gene pool and the adaptive alleles that help an organism's survival are passed to a larger proportion of the gene pool. Lastly, migration is when organisms move into or out of a population and it effects the gene pool when the organisms carry a different genotype different from the population because the effect is greater on allele frequencies than if these organisms carry a similar genotype.
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