Jovlo said:
I really don't know what you're arguing about.
Jovlo said:
Azuaron said:
AndyFromMonday said:
Your sexuality cannot be changed.
Okay... way too much misunderstanding about genetics' relationship to brain processes... As a psychologist, I will try to explain.
First, if homosexuality was purely genetic, gay people would need a "gay gene" somewhere up their family tree (or an unlikely random mutation), and, as far as anyone can tell, straight people are the ones who keep having children who turn out to be gay.
Thirdly, babies are never homosexual. Nor are they heterosexual. They are asexual. Children "discover" their sexuality during puberty. Anyone who claims sexual memories before puberty is reinterpreting nonsexual memories to have a sexual meaning later, lying, or was horribly abused as a child.
OK, just coming back on that first point...
If there is indeed a 'gay gene', that doesn't mean only gay parents can have gay children.
You'll notice I said: "First, if homosexuality was purely genetic, gay people would need a "gay gene" somewhere up their family tree (or an unlikely random mutation)." I did not say "gay people need gay parents." Pay attention.
Jovlo said:
The gene can be passed on through the gay persons straight siblings. Let me explain some basic genetics:
Everyone has two versions of each gene. One you get from your mother, the other comes from your father.
For example, there are several versions of the gene for eye colour, like a version that gives you blue eyes, and a one that gives you brown eyes.
Of the two versions of a gene you have, one will be dominant and be expressed. The brown eye version of the eye colour gene is the dominant one, so a person who has both the genetic material for blue and brown eyes will still have brown eyes.
When this person passes on his/her genes, the egg/sperm will have either a blue or a brown version to pass on.
This also explains why blue eyes are rarer than brown eyes, and why parents who both have brown eyes can have a blue eyed child.
Now, say that homosexuality works the same way (I'm not saying that it does, I just think it's very likely), the straight version of the 'sexual orientation gene' would be the dominant one, also explaining why homosexuality is much rarer than heterosexuality.
If both parents have a gay and a straight version of the gene, they can both be straight and have a 25% chance to have a gay child.
Now this was a simple example. Lots of traits are defined by more than one gene (for instance how tall you are). It is possible that you need 2 or more rare versions of genes that define your orientation, making homosexuality even rarer, or explaining bisexuality.
That's called simplified Mendelian genetics. It's actually much more complicated, especially when you get to how certain genes are expressed (or not expressed).
For example, sex is hard-coded, right? Very simple, no way around. XX, you're a girl. XY, you're a guy. Like, there's no way to be female without two X chromosomes, right?
Wrong. They're called XY females (or, technically, they have XY gonadal dysgenesis).
(I really couldn't tell you how it works [too complicated--which is my point], but I know it exists, and I know it's one of many examples that show why any argument of complex, behavioral Mendelian genetics falls flat on its face.)
Jovlo said:
And yes, it runs in families.
I know a lot of gay people who's siblings are gay as well.
I myself am proudly bisexual, and my family is filled with priests, several obviously gay but to afraid to come out.
Woah, pulling out that personal stories instead of hard data. Definitely the way to go.
The problem with siblings is that they grew up in a similar environment, so it's hard to pull apart what's genetic and what's environmental. You'll notice I talked about twin studies. In a twin study, they'll typically try to find members of several specific groups: identical twins that were separated at birth, identical twins that grew up in the same home, fraternal twins that were separated at birth, and fraternal twins that grew up in the same home. In this way, they can determine how much of a certain thing (e.g., homosexuality) is determined by: genetics, environment in utero, and environment/upbringing after birth.
The benefit of these studies is you can determine approximately
how much a given factor will influence a certain thing (e.g., development of homosexuality). For instance, you mentioned height. Height is not strictly genetic; nutrition strongly influences how tall someone will become. Using twin studies, it's possible to determine how much genetics influences height.
So... like I said in my previous post, twin studies have shown that homosexuality has a genetic component,
but genetics is not the only component. (Seriously, for most of your points, I can just refer you to my previous post. I don't know what you think you're refuting/adding.)
Jovlo said:
I think it's only a matter of time before a gene will be found.
I don't think it is. It's probably only a matter of time until a bunch of genes are found, along with a number of environmental and social influences, but that's not, "Ma'am, we've sequenced your baby's DNA, and he will be homosexual." (Interesting side-topic: if this were possible and you approached an anti-gay, pro-lifer with this information, would they be in favor of aborting the future-gay fetus?)
Jovlo said:
And on that third point:
Things like chest hair are geneticaly determined.
Yet have you ever seen a baby with chest hair?
Some genes are only expressed at a certain time.
First, yes, it's called congenital hypertrichosis (or "werewolf syndrome").
More seriously, the "chest hair" gene is a lot simpler than "gene to determine brain structure that must survive the complete rewiring of the brain--twice!--by the environment before it can be expressed."
But, like I said, homosexuality
has been determined to be partially genetic, there's just a lot of environmental influence upon it. Again, I don't know what you think you're refuting/adding to what I said. It's like you've looked at those three points you quoted and completely ignored everything else I said in that post.