Does A Gay Gene Exist Essay Research free essay sample

Does A Gay Gene Exist Essay, Research Paper Does A Gay Gene be? Two possible ways the familial stuff for homosexualism may be transmitted J. Michael Bailey of Northwestern U. and Richard C. Pillard of Boston U. did a survey on 161 cheery work forces. Each had at least one indistinguishable twin or fraternal twin or adopted brother. Fifty two per centum of the indistinguishable twins were besides homosexual, as compared with 20 two per centum of the fraternal twins and 11 per centum of the adoptive brothers. Similar surveies have been done by Dean Hammer and others with the same consequences. If one of the indistinguishable twins is cheery, so there is over a fifty- per centum probably goon that the other will besides be gay. This is strong grounds that homosexualism has at least a partial footing of heritage. Therefore, a hunt began to happen the homosexual cistron ( s ) . Dean cock noted that a apparently high figure of homosexual work forces that he studied had gay uncles on their female parent s side. We will write a custom essay sample on Does A Gay Gene Exist Essay Research or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page He speculated that the homosexual cistron ( s ) might be located on the Ten chromosome. Hammer examined X-chromosomes of cheery work forces, seeking to happen any differences with the X-chromosomes of heterosexual work forces. In the part Xq28, he found a form that was common to many homophiles. Two tierces of the homosexual work forces that he tested had that form. That would explicate the reoccurrence of the cistron despite its negative choice ( homophiles tend non to hold kids ) . Since males have merely one X chromosome ( compared with females who hold two ) , the cistrons on the chromosome are more likely to be expressed. Hence, a adult male with the Xq28 has a greater opportunity of being homosexual. As for adult females, presence of Xq28 does non look to impact sexual penchant. That may be due to their excess Ten or that the cistrons merely might non show themselves the same manner in adult females. Therefore, normal heterosexual adult females can go through the cistron down through consecutive coevalss. Other scientists like Richard C. Pillard and J. Michael Bailey have a different opinion.They believe that tonss or 100s tonss or 100s of allelomorphs are related to sexual attractive force. That believe homosexualism can be inherited genetically but do non claim to cognize the specific cistrons responsible. They speak of possible selective advantages of the family of homophiles. In their words â€Å"if allelomorphs persist for a status that is reproductively hurtful in the homozygote, thenthere must be a selective advantage for the heterozygote. # 8221 ; The conjectural advantage need non hold anything to make with sexual attractive force. It could affect cistrons of other properties. An illustration would be opposition to endemic disease. That would advance a larger sibship ( thereby countervailing the phenotypically cheery person ) . Another examplewould be personality traits associated with homosexual cistrons. A trait like that would better runing accomplishments is a good illustration. It would do up for the familial loss if these traits addition thesurvival rate ofkin. These scientists say that even if the selective advantage were little ( less than 2 % ) it would be sufficient to equilibrate the affect of the loss of birthrate of the homozygote. The two theories that I have discussed are validexplanations of how the cistron could be passed on systematically from coevals to coevals systematically. Possibly much more valid than if they were to stand on their ain. I feelit necessary to discourse some of the weak points of these theories. To believe in these theories, you must believe in familial determinism. Many people do non. They believe that environmentalfactors determine sexual orientation. They would reason that a societal behaviour every bit complex as homosexualism buzzword be governed by a twosome of cistrons. The theories themselves have been hardly lasting continued onslaught of the scientists. Many have already claimed the many homosexuals work forces who do non hold the Xq28 form? Many have claimed to hold disproved Xq28 theory. Many inquiries remain. How do you account forHomosexuals who dont have it? Alternatively, How do you account for straight persons who have it? A Canadian survey said that there was no important difference between maternal and paternal uncles being homosexual. As for the 2nd theory I discussed, the failing is that it is about impossible to nail the exact cistrons that find sexual orientation. The current theories are non converting. Twin surveies providestrong grounds of a familial factor in homosexualism. If there is a familial factor, so we are really far from cognizing what the cistrons are, and how they are transmitted. Scientists must go on seeking for a cheery cistron ( s ) . It will be tough and likely near impossible to come up with a complete reply.