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→Variation: Is an "allele" a gene? What does frequency mean in this context?
== Variation ==
== Variation ==
The prevailing theory in [[Biology]] is that natural selection is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic variation]] and selection pressures.
The prevailing theory in [[Biology]] is that natural selection is the mechanism by which [[allele frequency]] within a population changes over time due to [[genetic variation]] and selection pressures.
Natural selection is the mechanism in which members of a population exhibiting a specific [[phenotype]] have a reproductive advantage over other members of the population not exhibiting that phenotype. This is based on the current selection pressures in the environment. Due to this reproductive advantage, the group with the phenotype should produce more viable offspring that over time will increase their percentage in the overall population.
Natural selection is the mechanism in which members of a population exhibiting a specific [[phenotype]] have a reproductive advantage over other members of the population not exhibiting that phenotype. This is based on the current selection pressures in the environment. Due to this reproductive advantage, the group with the phenotype should produce more viable offspring that over time will increase their percentage in the overall population.