Essay On Evolution -- essays research papers

Essay on EvolutionThere are many mechanisms that lead to evolutionary channelise. One of themost important mechanism in evolution is natural selection which is thedifferential success in the replication of different phenotypes resulting fromthe interaction of organisms with their environment. Natural selection occurswhen a environment makes a one-on-one adapt to that certain environment byvariations that arise by mutation and genetic recombination. Also it favorscertain traits in a individual than other traits so that these favored traitswill be presented in the coterminous generation. Another mechanism of evolution isgenetic impulsion. Genetic drift is a random change in a small gene pussycat due tosampling errors in propagation of alleles or chance. Genetic drift dependsgreatly on the size of the gene puddle. If the gene pool is monstrous, the demote itwill represent the gene pool of the previous generation. If it is small, itsgene pool whitethorn not be accurately repre sented in the following 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 ...