(April 22, 2015 at 8:30 am)One Above All Wrote: Wrong. The actual conclusion is that, if there's a genetic factor, it's minor.Agreed.
Quote:Being born with it doesn't make it 100% (or even 1%) genetic.The fact that identical twins have a higher rate of concordance than fraternal twins indicates that there is a genetic factor, but as you note, it's minor.
I agree that fetal development is more than just genetics, if that's your point. But, identical twins not only share the same genes, they share the same womb at the same time. So, what factors are you proposing that work on one twin, but not on the other?