Sorry Obsequious, but as I remember it the crew land on the early earth and in one scene are watching the indiginous population from a ridge when a fact is thrown out that both crew and those they are watching are 'compatable'. I took this to mean the two would geneticaly mix or why bother mentioning it. And in the final scene as angel baltar and angel 6 walk around a modern city we are treated to T.vs showing lots of robots such as asimov and the like and the tag line what has come before will be again which I took to hint that we will go one to create an artificial life much like if not exactly like the cylons.
Baltar and 6 are also seen reading over the shoulder of a guy (who I’ve read was series creator Ron Moore) at a National Geographic article about the bones of a woman known as mitochondrial Eve, the most recent common ancestor to all human life. She lived in Tanzenia. We of course know the bones are Hera’s, there we agree.
Its been a few months since I last watched the show but I will dig out the DVD and watch again to system check my old feeble memory..
Perhaps the DVD contained deleted scenes which weren't originally broadcast? That must be the case, as I'm sure I saw no scene in which BSG folk observed indigenous humans and no scene implying that modern humans were going to start building cylons or something like cylons.
There was definitely a mention of prehistoric humans, but it was a throwaway line. The last scene of the show has the lead writer/producer guy (name escapes me, too lazy to Google) at a newsstand reading a National Geographic with a cover story about artificial intelligence.