" The intraclass correlations for peptic ulcer disease for MZ twins reared apart and together and DZ twins reared apart and together were 0.67, 0.65, 0.22, and 0.35, respectively. " But nobody gets it without h. pylori.
-
-
-
So an infectious vector at play?
-
Well, possibly. It could explain the mysteriously high prevalence, the associated mental illness, the high MZ twin discordance. Almost everything is heritable. but that can include syndromes with non-genetic key causal links.
-
Could male homosexuality be a form of innate altruism? Like birds warning kin of predator? Fewer males competing for mates within population means less murder and war, enhancing fitness of population. Could explain relation to birth order.
- End of conversation
New conversation -
-
-
And then, perhaps, sexual attraction — if we were able to measure it — might show a normal distribution from exclusively heterosexual to exclusively homosexual with the vast majority showing varying attraction to both.
-
In much the same way, it might be that some people like to eat rocks, while others prefer cheeseburgers, with most somewhere in-between.
End of conversation
New conversation -
-
-
Why does homosexuality persist? Why does the newest most efficient steel plant predictably produce bad batches of steel? Any successful system allows for error in the case of humanity it is how the genome learns.
-
Which is why a couple of percent of people are born blind, or born deaf, or born with a fucked-up liver, kidneys, pancreas, heart, stomach, etc. All of which systems are more complicated than being interested in the opposite sex.
-
Did I miss something or was that entire mega study based on 23 and me results which samples a very small portion of the genome. It's almost more of a thought exercise than anything else.
End of conversation
New conversation -
-
-
twin studies have disproven the existence of a gene that determines the subjective features of erotic attraction. there is no gay gene or straight gene or bi gene.
-
twin studies show a 25% concordance among homosexual MZ twins - that hardly eliminates genetic contributions
-
75% are discordant; the inclination to find the oppo sex sexually unappealing prob has some BASIS but is not determined. if it was the concordance rate would be at least in the 90% but it's way less than half.
-
Not determined by genes alone: but likely determined by something.
-
by what?
-
Behavior family society hormones friends etc etc
End of conversation
New conversation -
-
-
I would think that a hyperactive sex drive would lead to more success at producing heirs, but also could divert to other expressions of sexuality such as homosexuality. Hasn't this been advanced before?
-
Unlikely, because hyperactive sex drive doesn't automatically lead to more offspring but may in fact lead to fewer, and second, homosexuality is not caused by a hyperactive sex drive because if that were the case then gays would be having sex with women too.
-
"May lead to fewer" does not negate the possibility of more offspring on average Hyperactive could easily lead to more gay and straight sex, fitting the survey data cited I never said "caused" - just noted that I think it has been proposed as a factor
-
Evolution gave us eyelashes because those who did not have eyelashes got things in their eyes and had fewer offspring. That's orders of magnitude less influential than sex drive, so the notion that evolution hasn't correctly tuned sex drives is extremely unlikely.
-
Secondly, even if we do accept that notion, you still have to explain why you think that gay genes improve fitness in this particular way, rather than the millions of other possibilities.
End of conversation
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.