xq28 gay gene

  • Posted by a hidden member.
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    Apr 01, 2009 11:05 AM GMT
    http://www.en.wikipedia.org/wiki/xq28
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    Apr 01, 2009 11:59 AM GMT
    No simple cause for sexual orientation has been conclusively demonstrated, and there is no scientific consensus as to whether the contributing factors are primarily biological or environmental. Many think both play complex roles. The American Academy of Pediatrics and the American Psychological Association have both stated that sexual orientation probably has multiple causes. Research has identified several biological factors which may be related to the development of a heterosexual, homosexual or bisexual orientation. These include genes, prenatal hormones, and brain structure.

    I often wondered why Gays don't become extinct since they "breed " less often than hetero males. I found an article that tries to explain this phenomena. It seems that sisters of gay men have more children.

    http://www.livescience.com/health/080617-hereditary-homosexuality.html
  • cacti

    Posts: 273

    Apr 01, 2009 4:44 PM GMT
    kneedraggenI often wondered why Gays don't become extinct since they "breed " less often than hetero males.

    To me, from an evolutionary(and genetic) standpoint, it would make sense that gays would become more naturally prevalent as the world becomes more and more overpopulated.

    That is, of course, if you subscribe to any theory of humans evolving in a relatively very short period of time. And I kinda do. *shrug*
  • EricLA

    Posts: 3461

    Apr 01, 2009 4:48 PM GMT
    Last I heard from genetic experts is that they expect that homosexuality will be due to a series of genes, rather than a single "gay" gene.
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    Apr 01, 2009 5:08 PM GMT
    when I was about 15-16 I got caught by the parents on a gay website! (LOL..imagine that!)

    now my parents being who they are took me to my doctors....which he claimed being gay is a "choice".
    Now at age 13 I knew something wasnt' QUITE right...but honestly tell me what 13 year old knows anything about making a choice to be gay! I mean we didn't even have the internet at that time!

    I really think these theories are up to the doctors who do them beliefs!
    I would have to say it is either something you are actually born with...or something to do with your brain development. NOT that iam saying all gay guys are F*@Ked up! lol
    but just saying!
  • MSUBioNerd

    Posts: 1813

    Apr 01, 2009 5:08 PM GMT
    "To me, from an evolutionary(and genetic) standpoint, it would make sense that gays would become more naturally prevalent as the world becomes more and more overpopulated."

    To me, as an evolutionary biologist, that viewpoint is entirely misguided. Evolution is not forward looking, and it does not favor variants of genes which do not propagate themselves.

    Imagine, for the sake of argument, that there's a version of a gene that causes individuals not to breed when the population density is really high. If a mutation arises in a single individual in this population, causing him to have children even though the population density is high, that individual will end up having more children than average in the population. Consequently, any genetic variants he has will be passed along more often than genetic variants others have--meaning that this new tendency to have kids even though the population density is high will spread. Conversely, if there's no tendency to avoid having kids just because the population density is too high, a new mutation that causes someone to limit his reproduction won't be favored, as it will just mean that one individual doesn't have children and thus the genetic variant is lost. Even if the population as a whole would be better off if individuals didn't have too many kids, each individual gene will benefit if it can cause the individual carrying it to reproduce in such a way that it gets the most copies of itself possible into future generation.

    As for the root causes of homosexuality in humans, the evidence on region xq28 is shaky at best-- in some studies it looks significant, in others it doesn't rise above the levels of random chance. The explanation with the greatest replicability across studies is birth order for males: the more previous male pregnancies the birth mother had, regardless of whether the child is raised by her or adopted by someone else, the greater the probability that the boy will grow up to be gay. It is hypothesized that the mother's body reacts immunologically to the male fetus, particularly to the higher testosterone levels it produces, and that this response can have an impact on development. That doesn't appear to be the case with lesbians, however. It is important to note, however, that this is a great example of how something can be biological without being genetic.
  • junknemesis

    Posts: 682

    Apr 01, 2009 5:09 PM GMT
    No, I don't think it makes sense to say it's a conscious choice.
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    Apr 01, 2009 7:24 PM GMT
    EricLA saidLast I heard from genetic experts is that they expect that homosexuality will be due to a series of genes, rather than a single "gay" gene.
    lots of things are like that. not determined by a single gene. but determined by interaction of some genes.
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    Apr 01, 2009 7:44 PM GMT
    yes because

    wikipedia has the most accurate data