Natural Selection Importance - Essay Example

The effect of natural selection is at the level of the individual. Natural selection plays an important role in shaping the individual genotype. George Christopher Williams in his book Adaptation and Natural Selection writes, “The contest was decisively won by natural selection, in my opinion, when by 1932 the classic works of Fisher, Haldane, and Wright had been published” (3). Acceptable evidence is not forthcoming in support of other systems of evolutionary change or any other genetic system of adaptations. Thus natural selection in shaping life is the accepted theory.

The world is going through the process of changes at different levels and most of them are related to human activity that goes on without intermission. Evolutionary biology provides perfect understanding and increases awareness. Regina Bailey argues that “Biological evolution is defined as any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable. For an event to be considered an instance of evolution, changes have to occur on the genetic level of a population and be passed on from one generation to the next” (Bailey…). It helps to predict short and long- term results of variations in the environment, global warming and results of application of pesticides. Interaction between adaptation and chance are the conflicting agents in the process of natural selection. When we say variation is the key concept, the role of lineages that are engaged in the competition goes to prove the importance of natural selection. Biological species are not unchangeable entities and they are ever on the flux.