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Does A Gay Gene exist Two possible ways the genetic material for homosexuality may be transmitted J Michael Bailey of Northwestern U and Richard C Pillard of Boston U did a study on 161 gay men Each had at least one identical twin or fraternal twin or adopted brother Fifty two percent of the identical twins were also homosexual as compared with twenty two percent of the fraternal twins and eleven percent of the adopted brothers Similar studies have been done by Dean Hammer and others with the same results If one of the identical twins is gay then there is over a fifty- percent likely hood that the other will also be gay This is strong evidence that homosexuality has at least a partial basis of inheritance Thus a search began to find the gay genes Dean hammer noted that a seemingly high number of homosexual men that he studied had gay uncles on their mothers side He speculated that the gay genes might be located on the X chromosome Hammer examined X-chromosomes of gay men trying to find any differences with the X-chromosomes of heterosexual men In the region Xq28 he found a pattern that was common to many homosexuals Two thirds of the gay men that he tested had that pattern That would explain the reoccurrence of the gene despite its negative selection homosexuals tend not to have children Since males have only one X chromosomecompared with females who have two the genes on the chromosome are more likely to be expressed Hence a man with the Xq28 has a greater chance of being gay As for women presence of Xq28 does not seem to affect sexual preference That may be due to their extra X or that the genes simply might not express themselves the same way in women Thus normal heterosexual women can pass the gene down through successive generations Other scientists like
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