Epigentic markers are sequences that tell a cell how to change DNA code into protiens. They vary somewhat from person to person, just like DNA. They change, just like DNA. Since both sperm and ovum have these markers, they are inherited. However, my understanding is that it is a very difficult task to determine exactly which markers act on which strands of DNA, and what effect they have.
The article is about a claim that the pattern of homosexuality in many families fits a pattern that would be associated with epigenitic markers, AFAICT.
Yeah, because a ten-year-old would understand that. :P
Still, I think I understand it better now. Doesn't seem like too major of a revelation -- the evidence already seemed to be saying that that homosexuality arose at least partly from biological factors rather than solely as a product of upbringing. I guess it's nice that we may have discovered the mechanism, but I can't say that I care much.
"Yeah, I got a way to defend it. Bring a bat to the game and kill one of them."
-Nick Van Exel, on defending the Stockton-Malone Pick & Roll