How is evolution defined in genetic terms

In genetic term, evolution can be defined as any change in the frequency of allele in a population over a period of time.

Natural selection usually brings about changes in the genetic variation of a population of organisms over a period of time, this process might lead to speciation, which is formation of a new specie that is distinctly different from those that had been existing before. Genetic evolution through natural selection usually enhance an organism's ability to survive' in its environment.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

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