Homosexuality - inheritied?

  • Posted by a hidden member.
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    Dec 12, 2008 10:22 PM GMT
    http://news.bbc.co.uk/1/hi/health/3735668.stm

    Click onto this, what do you think?
  • Posted by a hidden member.
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    Dec 12, 2008 10:27 PM GMT
    and it still leaves us to ponder...

    How Do You Explain Lesbians? icon_eek.gif

  • NYCguy74

    Posts: 311

    Dec 12, 2008 10:45 PM GMT
    NotThatOld saidClick onto this,


    Copy and paste that or

    click on this one
    http://news.bbc.co.uk/1/hi/health/3735668.stm
  • kinetic

    Posts: 1125

    Dec 12, 2008 10:49 PM GMT
    I love how they have a random photo of George Michael! LOL
  • Posted by a hidden member.
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    Dec 12, 2008 11:21 PM GMT
    wow thats interesting...
  • MSUBioNerd

    Posts: 1813

    Dec 13, 2008 12:12 AM GMT
    It's a reemergence of the argument that something in the genetic region Xq28 can predispose men to being gay. There's some possibility there, but the data is much shakier than that which deals with birth order effects. In general, the more previous males that resided in the womb in which you develop, the greater the odds that you'll be gay (if male), regardless of whether you're adopted or those older brothers were adopted.
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    Dec 13, 2008 1:21 AM GMT


    We've been reading about long years of study around
    amniocentesis results and after following a test group for 20 years researchers have discovered that mothers whose amniotic fluids had four times the normal levels of testosterone usually ended up with gay kids - male and female. Interesting, eh? Looks like we're back to blaming Mom. Poor Mom.
  • Posted by a hidden member.
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    Dec 13, 2008 1:29 AM GMT
    I have little question that there's a genetic factor involved. For two generations, every male child from my father's side of the family was gay: Me, my male cousin on that side of the family, and his sister's son. Now that's only three of us, and I suppose it could be a big coincidence, but I'm guessing it's not.

    And if it's not a coincidence but is genetic, that would mean in my case, my mother had nothing to do with it.
  • MSUBioNerd

    Posts: 1813

    Dec 13, 2008 2:03 AM GMT
    The thing is...if you think it's this genetic factor which explains your own orientation, you would still be less likely to have gay men on your father's side of the family than on your mother's.

    Simple genetics lesson: Human have 23 pairs of normal chromosomes, and one pair of sex chromosomes. Barring highly unusual cases, if you've got an X and Y you're male; if you have two X chromosomes, you're female. The genetic region in question is on the X chromosome. Boys get their X chromosome from their mother and their Y chromosome from their father. You don't share an X chromosome with your cousin on your father's side of the family, nor with his nephew. You probably do share an X chromosome with cousins on your mother's side, but that's a probability calculation based on the number of siblings your mother and your mother's parents had.

    While I don't rule out genetic explanations, they suffer from the high rate at which monozygotic (ie identical) twins do not have the same sexual orientation. From a genetic standpoint, monozygotic twins are clones, so if they don't show an extremely high degree of concordance on a trait, you need to consider non-genetic factors. Birth order affects, which rely on maternal hormones and antibodies affecting the probability of certain types of hormonal and neural development, don't have that problem, and are more consistently replicated than this particular genetic marker is.
  • Posted by a hidden member.
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    Dec 13, 2008 2:13 AM GMT
    If my son pics up a barbie I will toss that little fag against the wall!

    lol okay I wont but still I'd be scared to have a gay son. Gay daughter, not so much but a gay son. We all know how men are, I really don't want to beat the shit out of some jerk for hurting my son.
  • Posted by a hidden member.
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    Dec 13, 2008 2:34 AM GMT
    Thing about having kids... it's like taken a piece from a box a chocolates...you never know what you're gonna get.

  • Posted by a hidden member.
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    Dec 13, 2008 2:59 AM GMT
    MSUBioNerd saidBirth order affects, which rely on maternal hormones and antibodies affecting the probability of certain types of hormonal and neural development, don't have that problem, and are more consistently replicated than this particular genetic marker is.


    How would birth order effects explain a family like mine in which the oldest - me - is gay while the 4 younger sibs are not only straight but with each successive birth, more obviously so?
  • asupas

    Posts: 234

    Dec 13, 2008 3:20 AM GMT
    Both of my parents are bi-sexual. Maybe two bi's makes a gay? icon_smile.gif
  • Posted by a hidden member.
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    Dec 13, 2008 8:30 AM GMT
    MSUBioNerd saidThe thing is...if you think it's this genetic factor which explains your own orientation, you would still be less likely to have gay men on your father's side of the family than on your mother's.

    Simple genetics lesson: Human have 23 pairs of normal chromosomes, and one pair of sex chromosomes. Barring highly unusual cases, if you've got an X and Y you're male; if you have two X chromosomes, you're female. The genetic region in question is on the X chromosome. Boys get their X chromosome from their mother and their Y chromosome from their father. You don't share an X chromosome with your cousin on your father's side of the family, nor with his nephew. You probably do share an X chromosome with cousins on your mother's side, but that's a probability calculation based on the number of siblings your mother and your mother's parents had.

    While I don't rule out genetic explanations, they suffer from the high rate at which monozygotic (ie identical) twins do not have the same sexual orientation. From a genetic standpoint, monozygotic twins are clones, so if they don't show an extremely high degree of concordance on a trait, you need to consider non-genetic factors. Birth order affects, which rely on maternal hormones and antibodies affecting the probability of certain types of hormonal and neural development, don't have that problem, and are more consistently replicated than this particular genetic marker is.


    I have no explanation except I think there must be one and I'd think it would have to be genetic. It could just be coincidence, or it could be "There are more things in heaven and earth than are dreamt of in your biology, Mr. BioNerd." icon_wink.gif

    Really, I don't know. You, of course, know far more than I. Understanding biology has never exactly been one of my strengths.

    Btw, FWIW, I know a pair of fraternal male twins who are both gay.
  • Posted by a hidden member.
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    Dec 15, 2008 9:03 PM GMT
    real question is, does it fucking matter? no, somethings should and will be left unanswered.