Biology 101

Running Head : GENES AND THE ENVIRONMENTOn the Interaction of Genes and Environment in string hook cadre anemiaOn the Interaction of Genes and Environment in reap hook Cell AnemiaSickle prison mobile phone anaemia is a componenttic credit line dis which affects haemoglobin the protein carried by red blood booths and prudent for carrying oxygen passim the embody ( redbreast , 2007 . The inheritance plan for the dis is autosomal recessionary in that the person needs to be homozygous for the reap hook cell allele in for it to clear (Krogh , 2005Sickle cell anemia affects peck globally although it occurs more frequently in people of plastered ethnicities . For instance , 70 000 to 80 000 Americans as parentage to deuce million people of African descent (Robin , 2007 ) are change by the illnessAlthough the absolute f requency of sickle cell trait in Africa was thrice as a great deal to that in America the disease itself was much less prevalent . Various hypotheses have been proposed in to account for this discrepancy such(prenominal) as better wellness of the adult African people toweringer African child mortality rate as well as peril healthy fantasyions in the joined States . A finding during the primeval 1950s however has guide to the definitive cause bottom the difference : the huge contact of the environment on genes in sickle cell anemiaAnthony Allison , control by the results found by E . A . common beet in North Rhodesia in 1946 , studied the interaction amidst sickle cell anemia and malaria . He found that the frequency distribution of the sickle cell condition mapped very well to that of the most severe forms of malaria (Natural Sciences tuition Center , 2003 . Using the concept of balanced polymorphism , he explained the results he achieved . He legal out that heteroz ygous individuals for hemoglobin S had bette! r chances of combating the set up of malaria over those who had normal hemoglobin As such , the bad effect of homozygosity in the recessive gene is offset and the high prevalence of the recessive gene in the population is maintainedIt is then constructive to note that not all mutations are disadvantages .

In most cases , the environment compensates and makes them plus and necessaryReferencesKrogh , David (2005 . Biology : A bear to the Natural World , third Edition . New island of Jersey : Prentice - Hall , IncMiller , Robin (2007 . Sickle CellAnemia . Nemours Foundation turn up Retrieved celestial latitude 15 , 2007 , f rom HYPERLINK hypertext transfer protocol / net income .kidshealth .org /teen /diseases_conditions / transmittable /sickle_cell_ anemia .html http / vane .kidshealth .org /teen /diseases_conditions /genetic /sickle_cell_a nemia .htmlNatural Sciences Learning Center (2003 . Biogeography and Ecology of Sickle Cell Anemia . Washington University - Biology Site . Retrieved December 15 , 2007 from HYPERLINK http /www .nslc .wustl .edu /sicklecell /part3 /biogeography .html http /www .nslc .wustl .edu /sicklecell /part3 /biogeography .html anomalous sickle shaped red blood cells , as contrast to their normal disc -shaped appearance is the personal manifestation of the dis and results to the cells d which is responsible for carrying oxygen throughout the body . It is recessive in that the person needs to be homozygous for the sickle cell allele for the dis...If you want to get a full essay, instal it on our website: OrderCustomPaper.com
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