Natural selection can cause microevolution (change in allele frequencies), with fitness-increasing alleles becoming more common in the population. ... Natural selection on traits determined by multiple genes may take the form of stabilizing selection, directional selection, or
How does natural selection affect gene frequency?
Explanation: Natural selection decreases the frequency in a population of genes that decrease fitness and increases the frequency of genes that increase fitness. **Note that fitness in ecology refers to an individual's ability to survive and produce viable offspring.
What affects allele frequency?
From the theorem, we can infer factors that cause allele frequencies to change. These factors are the "forces of evolution." There are four such forces: mutation, gene flow, genetic drift, and natural selection.
