DNA is simply digital blood testing. There is no double helix, no RNA, no way to narrow down who you are by spitting into a cup. I doubt chromosomes exist too, in reality, our micro world is as fictive as our macro outer space world. You’re looking at made up art and science fiction concepts.
The 23 and me and ancestry tests are also pure fiction. The application simply gives them enough info to fit you in their massive family tree,which is full of countries and ethnicities for them to tell you about.
In the comments for Maarten’s recent post regarding the flying Yugo, the conversation turned towards the inevitable question of who would participate in such a ruse? My immediate guess is military personnel. No big headline, that, but it should be stated once again to ward off the suspicion that actual criminals may be involved. The people used in hoaxes have to be reliable, and the notion of a criminal being reliable long term doesn’t really add up, in my opinion.