Sort of both. I mean, keep in mind that as a fictional device, it was invented by a bright high school student, not a practicing geneticist. It doesn't get "watered down" in successive generations, even if both parents don't have it; it either of a person's parents is a Detian, that person will be as well. The only functional difference for a "first generation" recipient is that they weren't born that way.

The one exception I can think of is Tali'Shukra vas Venachar's family line, where it appears to have skipped a generation, but then she received a treatment that was reverse-engineered for quarians from a stolen sample of human Omega-2 that had already been revised for salarians, so who the fuck knows. :)

--G.
-><-
Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
zgryphon at that email service Google has
Ceterum censeo Carthaginem esse delendam.