Positive Selection

Selection in itself is neutral while positive selection implies that the selection results into a divergence among species. Studies all mention the involvement of positive selection on the gene implication. Positive selection is the core of Darwinian theories of evolution and is the simplest way of explaining the retention of mutations in organisms that allow them to become competitive in the environments they exist in. However, more recent researches have also have shown that though positive selection remains a core principle in understanding evolution of organisms, the action of positive selection in the body systems, particularly those of the nervous system is not directly conclusive to the changes in nucleic changes that have been observed in genomes. One of the consequences of the theory of positive selection to human brain evolution is that it implies that the surviving humanoid specie today is the most intelligent in coping with his environment. It implies that whatever skills that humans developed in the course of this evolution allowed them of have competency that non-survives lineages did not have. Unique characteristics of human like speech, intelligence, technology and the very characteristics of our physiology have all contributed to the human dominance that exists today. However, some researches have also shown that what we think are distinct to humans may not be as distinct at all. All species have their own systems of communication, culture and society that can not be grasped by our understanding. However, just as undeniable is the fact that there are characteristics like speech and brain capacity that have propelled human evolution: they may have not set us apart format he rest of all organisms but they have certainly allowed the survival of our specie.