The definition of gene flow is the transfer of alleles of genes from genius race to another.(Wikipedia ). Gene flow help human to be for millions years, it used to help human lived in harsh surround and evolution. There are three examples shown below to explain how gene flow works and changed our organic structure.
Firstly, I would like to mainly take to task about the convergent and divergent of human body haircloth. Darwin suggested that depilation was favored when men and women were picking sexual partners (Wade 24). Therefore, the proportion with slight body hair attracted much mate, consequently, they would hold back much opportunities have descendants which have less body hair. Different from modern, the ordination our ancestors lived was polygamy, which means, the individuals with hairless may have a lot wife but the others may have no chance to breeds. The les body hair gene would from one to next generation with more and more proportion until all human are hairless.
However, since the dissimilar area that our ancestors moved to, some of them lived in a toothsome environment and some settled at cold place, the divergent gene of body hair happened at different place. The population near to equator lived in hot environment which means they convey less or no body hair to mitigate the ability of heat elimination of body cutis. Oppositely, the population who lived far from equator, due to the colder environment and windy, they need more body hair to keep body energy.
In addition, the different skin dissimulation is similar to the divergent of body hair. Actually, our ancestors are all unfairness skin color because the dark color could protect skin from the sun`s harmful radiation like invisible rays. As the migration of population the gene flow keep diminution the dark skin proportionally to the distance from...If you want to permit a full essay, order it on our website: Ordercustompaper.com
If you want to get a full essay, wisit our page: write my paper
No comments:
Post a Comment