EVOLUTION
Type: essay volume: 15 pages Sources: 5 to 10 Why Evolution is True. Introduction. Evolution can generally be defined as the change of genetic composition of a population over successive years. In line with the modern evolution theory, evolutionary change contains some major tenets. According Jerry (2009) the evolutionary change comprises six major tenets, they include the following; evolution, gradualism, speciation, common ancestry and natural selection. According to the Darwinism principle, in the evolution stage species undergo genetic change, over a number of years. However as mentioned above, evolution is not the only tenet of the modern evolution theory. Jerry (2009) also argued that evolution is normally coupled with other processes. At no instance can evolution be complete without the other tenets of evolution. One of this major tenets in evolution is, gradualism. This theory holds that profound change in the genetic makeup of a species is as a result of cumulative change that is continuous. This cumulative continuous change facilitates the substantial evolutionary change of species. According to the Darwinism principle, gradualism principle forms the basis of the evolutionary theory- hence evolution is considered as a gradual and slow process. However it is worth noting that gradualism occurs at different paces in different species. Some species can take millions of years to evolve while others can take few years to evolve. Another tenet of the evolutionary theory is the common ancestry. This principle, holds that life is based on the same fundamental biological makeup. Using DNA sequence or the fossils, all the organisms can be traced back to a common organism. However Jerry (2009) suggests that organisms with the recent common ancestors share a lot of common traits while those organisms with a distant common ancestor don’t have a lot of common traits. This natural classification is in itself a strong evidence that evolution existed. Another major evolutionary theory tenet is the speciation. Speciation can be defined as the process through which new species are formed from an initial one. This tenet is heavily related to the common ancestry principle. Jerry (2009) suggests that species can be traced using their fossils and DNA back to the descendants that are joining with other species ancestors. Jerry (2009) fails to critically look into the tenets of evolution. At no instance can evolution exist in exclusion of the above major tenets- this is because they are imperative in the entire evolutionary theory. Jerry (2009) only discusses the Darwinism principle.
