Essay On Evolution -- essays research papers

Essay on EvolutionThere are many mechanisms that hunt to evolutionary change. One of themost important mechanism in evolution is natural selection which is thedifferential success in the reproduction of different phenotypes resulting fromthe fundamental interaction of organisms with their environment. Natural selection occurswhen a environment makes a individual adapt to that certain environment byvariations that arise by mutation and transmittable recombination. as well it favorscertain traits in a individual than other traits so that these favored traitswill be presented in the next elementration. other mechanism of evolution isgenetic drift. Genetic drift is a random change in a small gene pool due tosampling errors in propagation of alleles or chance. Genetic drift dependsgreatly on the size of the gene pool. If the gene pool is large, the better itwill represent the gene pool of the previous generation. If it is small, itsgene pool may not be accurately represented in the next generation due tosampling error. Genetic drift usually occurs in small populations that containless than 100 individuals, but in large populations drift may have nosignificant effect on the population. Another mechanism is gene flow which iswhen a population may gain or lose alleles by the migration of fertileindividuals between populations. This may cause the allele frequencies in a genepool to change and allow the organism to evolve. The most obvious mechanismwould ...