Evolution Essay -- essays research papers

Charles Darwin had two great themes in "On the line of reasoning of Species" which accounted for the similarities and adaptations characteristic of living organisms. To account for the adaptations of organisms and those innumerable features that equip them for survival and reproduction, Darwin (and Wallace) singly came up with the central theory of evolutionary process natural plectrum. immanent pickaxe gives insight in to why organisms atomic number 18 the way that they be. Adaptations are phenotypic variants that result in the highest fitness among a specified practice of variants in a given environment. In reference to humans, in that location are many traits that have been selected and adapted for throughout their evolutionary history gift them the characteristics that they have today. In this paper I will discuss around parts of the human body, which have been found to be selected for by the evolutionary mechanisms of natural selection, adaptation and mutatio n. Natural selection, adaptation, and mutations are three components of the evolutionary process, from each one one having either positive or negative effects on the other. What exactly is natural selection? there are many variations of the rendering but most agree that it must include the following concepts well-nigh attribute or trait must vary among biological entities, and there must be a consistent relationship, within a define context, between the trait and one or more components of procreative success, where " generative 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 olibanum characterized will have the best chance of being preserved in the struggle for life and from the strong principle of inheritance, these will tend to reach offspring similarly characterized." Regardless of how it is defined, natural selection and its action offer have tremendous effects on the members of a population. It is natural selection that causes adaptation, and these adaptations evolve to ensure the survival of a species. Evolution, in a very broad sense, is defined as descent with modification and often with variegation (Futuyma, 1998). Darwins idea of evolution was that it occurred by descent with modificatio... ...-carbohydrate, high protein viands. Certain metabolic adaptations were therefore necessary to accommodate the low glucose intake. Many indicate that the accommodative response to the low carbohydrate intake is insulin resistance(Miller, Colagiuri, 1994). A study make by J.C. Brand Miller and S. Colagirui proposes that insulin resistance offered a survival and reproductive advantage during the Ice Ages. This study also proposed that a carnivorous diet would have disadvantaged reproduction in insulin-sensitive individuals and positively selected for individuals with insulin resistance. Another agent 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 locoweed 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 cartridge clip will soon tell exactly how the evolutionary mechanisms have set up the human race. The human species will continue to evolve as extensive as the mechanisms of evolution and environmental factors act upon us.