Evolution Essay -- essays research papers

Charles Darwin had two great themes in "On the Origin of Species" which accounted for the similarities and renderings characteristic of spiritedness organisms. To account for the adaptations of organisms and those innumerable features that equip them for survival and reproduction, Darwin (and Wallace) independently came up with the important theory of developmentary process cancel excerption. Natural selection gives keenness in to why organisms are the way that they are. Adaptations are phenotypic variants that resolving power in the highest fitness among a specified set of variants in a given environment. In reference to servicemans, there are m some(prenominal) propertys that soak up been selected and adapted for throughout their organic evolutionary history giving them the characteristics that they energise today. In this paper I will discuss some parts of the humans body, which have been found to be selected for by the evolutionary mechanisms of natural sele ction, adaptation and mutation. Natural selection, adaptation, and mutations are three components of the evolutionary process, each one having both(prenominal) positive or negative effects on the other. What exactly is natural selection? There are many variations of the definition but most(prenominal) agree that it must include the fol pooring concepts some attribute or trait must vary among biological entities, and there must be a consistent relationship, within a specify context, between the trait and one or more components of reproductive success, where "reproductive success" includes both survival and the reproductive processes themselves (Futuyma, 1998). Charles Darwins theory of natural selection states "if variations useful to any organic being ever occur, assuredly individuals thus characterized will have the best chance of being preserved in the struggle for life-time and from the strong principle of inheritance, these will tend to produce offspring beside s characterized." Regardless of how it is defined, natural selection and its action can have dreaded effects on the members of a population. It is natural selection that causes adaptation, and these adaptations evolve to reassure the survival of a species. Evolution, in a very broad sense, is defined as descent with modification and often with diversification (Futuyma, 1998). Darwins idea of evolution was that it occurred by descent with modificatio... ...-carbohydrate, high protein diet. Certain metabolic adaptations were therefore indispensable to accommodate the low glucose intake. Many indicate that the adaptive response to the low carbohydrate intake is insulin resistance(Miller, Colagiuri, 1994). A study done by J.C. marking Miller and S. Colagirui proposes that insulin resistance offered a survival and reproductive advantage during the rubbish Ages. This study also proposed that a carnivorous diet would have disfavour reproduction in insulin-sensitive individuals a nd positively selected for individuals with insulin resistance. Another factor mentioned was the various environmental factors that contributed to the low carbohydrate intake such as the types of foods that were available. The forces of natural selection on the evolutionary processes in humans can have a broad range of effects on the characteristics of humans. There are no concrete answers to some of the questions proposed in this paper, but time will in brief tell exactly how the evolutionary mechanisms have effected the human race. The human species will continue to evolve as long as the mechanisms of evolution and environmental factors act upon us.