Biology Current Event

Dionne Crafford30 April 2007 on-line(prenominal) level offt : indispensable SelectionSummary of Article : Natural Selection Continues even After Sex (included in Appendix in MS Word format and obtained from : HYPERLINK http /network .medicalnewstoday .com /medicalnews .php ?newsid 62919 http /www .medicalnewstoday .com /medicalnews .php ?newsid 62919The following is a summary of the above-mentioned article : Natural Selection Continues level(p) After Sex (Shackelford . With regards to gracious fosterage , graphic born(p) selection is seen as a utensil that re tout ensembley draws a person to a genetically suitable confrere . This mechanism may rely on aspects such as corporal features indicating health status However , researchers (Todd Shackelford and Aaron Goetz in Current Directions in Psychological Science qtd . i n Shackelford ) suggest that accredited post- coition mechanisms flummox evolved in humans to ensure successful handing everyplace on of genetic material . The question arises : How did this set ? ain matters (described by the causalitys of the article as extra curricular informal intercourse ) may result in investment of a manful person s resources in un associate offspring (i .e . not genetically related . This basically boils down to competition (which is too an bionomic fundamental interaction ) and is proposed to be the driving force for natural selection in this instance . Competition also affects spermatozoan count in that the number of sperm in the bellow also increases with change magnitude time away from the sexual partner . The potential capability of the penis in corporally removing an interloper s sperm has also been examined However , apart from the physical biologic aspects reliable behavioral accommodations also appear pertinent . As deep copulatory thrusting may real serve to pot! entially carry away the sperm of a rival , it makes comprehend that human males develop lustful feelings after macrocosm apart from their partners for extended periods . In conclusion the author poses the question : What other undiscovered ship canal have humans evolved in a world order by survival of the fittest .

With human reproduction potentially being set by natural selection as an evolutionary harness race between males and females , counter adaptations are seeming and the relevancy of this question is almost self-explanatoryWhat biology does this article referenceAs indicated by the name , the article deals with the princi ple of natural selection utilize to human reproduction . In short , natural selection transpires into adaptation resulting from a particular selection pressure , in this case competition . As stated by Begon , harpist and Townsend (8 : An individualistic will survive , reproduce and leave descendants in some environments but not in others . This is the sense in which nature may be loosely perspective of as selecting . In this case competition led to certain biological and behavioral adaptations thought to increase chances for successful universe post-copulation . When believe the basic propositions on which Darwin s theory rests , this principle belong wee . These propositions , as listed by Begon , Harper and Townsend (7 , are : 1 ) Individuals at heart a population are not homogeneous 2 ) Some of this variation is heritable 3 ) in all populations have the potential to populate the whole earth 4 ) Different individuals leave different numbers of descendants 5 )This numb er depends on the interaction between the individual.! ..If you want to return a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay