Tom3k said:
And since your are arguing that fitness is reduced, I'll only point out to numerous contraception methods that heterosexuals use as well. From simple pill to vasectomy. And on top of everything you assume that all gay people are out and proud, and have intercourse only with same gender. While the truth is not that fabulous. And the biggest misception that you make is a claim that "from genetic point of view homosexuality is disfunctional". Why? Because you assume again that only reason to have sex is to reproduce. News flash... It's not, it's because it feels good. Humans have sex, because it feels good. It's that simple. Humans have sex because it feels good, but humans also evolve because of sex. Sex with no outcome = no evolution. Seriously? Please, make up your mind already... Is there or isn't there a "gay gene"? You are now comparing autism and homosexuality? Let's do a little search... http://www.ncbi.nlm.nih.gov/gene?term=autism and then http://www.ncbi.nlm.nih.gov/gene?term=homosexuality . Do you see the difference or I really have to spell it for you? Just to make it simple. If we do a search for "genes" related with autism we get 409 hits, if we conduct the same search for homosexuality we get zero hits (actually we get one hit which was withdrawn from database). So it's kinda obvious that you can "treat" autism with gene theraphy since you know what to target, while at same time no genes related with homsexuality are this far recorded or known. Some statistical data even suggest that every 5th person is gay. The general concensus is between 5-8% if I'm not mistaken. It's hard to tell exact numbers because many people for one or another reason are in closet. The simple fact that high number of population is queer is proof enough that homosexuality is not as random as you think. The twins studies pretty heavily supported that statement as well. And the most recent epigenomic studies even heavily support that homosexuality can be inherited. You haven't actually explained anything. You keep on going in ciricle while completly ignoring the things I'm trying to explain to you. And I never "claimed" that there is a gay gene. it's not me who's "chainging" genes with mutations, it's you. "Every variation in every organism is created by the development of a genetic mutation. If you're short, tall, dark-skinned, light-skinned, blue-eyed, brown-eyed, etc. it's because at some point in the history of your ancestral line, one of your ancestors developed a genetic mutation. Every gene in your body is technically a genetic mutation. So what's the difference between amutation and a defect? A genetic defect is a disease or disorder that is inherited. The two most important parts of that definition (for our argument) are the terms disease and disorder. So what determines whether something is a disease or disorder or whether it's just a variation? I have blue eyes, caused by a genetic mutation. Most of my friends have brown eyes. Does this mean that I have a disease or disorder of the iris? Should I seek treatment to change my eye color, so I'll look more like my brown-eyed friends? No, because my blue eyes aren't a problem for me. They don't cause me harm, discomfort, or distress. I'm perfectly fine with having blue eyes. In fact, I like my blue-eyes mutation; it's one of my favorite genetic variations. Let's say for the sake of our argument that homosexual behavior is caused by a genetic mutation. Does that mean that we should classify it as a genetic defect? If it doesn't cause homosexual individuals harm, discomfort, or distress, and it's not unwanted, then it's not a genetic defect, just a variation. Natural selection dictates whether a mutation will continue in the species. A mutation that works against the survival of the species (such as an inability to breathe) eventually disappears because the last generation of animals with that mutation will die before they can reproduce. A mutation that helps the survival of the species (such as the ability to use tools) or makes no difference at all (such as my blue eyes) will probably continue because those with such beneficial or insignificant mutations will likely go on to have offspring who have the mutation as well. If homosexuality is a genetic variation, then it's up to natural selection to decide if it will continue or not." |
So explain to me why schizophrenea, a disorder, believed to be genetic, is not heritable after only a single generation? (Grandchildren of schizophrenicas have basically the same chances of developing the disorder as the regular population.
Not all genetic mutations are errors in DNA replication. Different conditions during pregnancy can alter the steroid balance (estrogen and testosterone) in humans. Can it not alter some other chemical (even another steroid), to reassociate phermone release and whatever chamical is used to turnpeople on?
Anyway, even if you're looking strictly at genetic mutations causeing evolution, there are multiple different types of mutations, not all of them are heritable.
I beleive that homosexuality is a disorder that develops during pregnancy, but it could be due to various other factors such as the reaction between multiple different genes. Maybe 1 gene causes a chemical imbalance, another causes humans to become homosexual in the presence of this imbaloance, a third gene which normally corrects for errors in sexual arrousal could be ineffient, etc. I'm not a Biologist, I only took a couple credits in Bio, so I won't claim to know exactly how homosexuality works. No one does. However, even if you just look at wikipedia, the scientific community is leaning to biological factors over psychological.
Still, biological or psychological, homosexuality is still a disorder IMO. People don't just choose to be gay, if that were the case, homosexuals who want to be heterosexuals would just choose to be straight. Many people here believe it's just sexual preference, but if that were the case you should still find females attractive.
I don't think sexuality is a fluid medium, I don't think people are all bisexual, and most people just tend to be heterosexual. IMO, sexuality is black and white, most people are heterosexuals, and those who are not, are not heterosexuals are so because of some sort of defect/disorder/condition. I believe that disorder is biological in nature, similar to schizophrenea, while many believe it's psychological (you had bad experiences with people of opposite genders growing up). I'm not on the band wagon that think's it's nothing out of the ordinary. There is always a cause, it's just a matter of weather we classify that cause as normal, or is it predetermined at birth?
I was talking to a few people today, and I think in 20 years we will find out answer. You can do a genetic background test and get your genome mapped to determine what diseases/medical conditions your genes are more prone to get, and what diseases/medical conditions you are immune to. When these tests become cheaper and more accurate we will be able to compare people who admitted to being homosexual and seeing if their genetics are similar. If they are, and we can isolate genes exclusive to homosexuals, then we can finally have conclusive evidence for this matter.
Until then 
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