The episode I was referring to began with Dr. Galen, Picard’s old archeology teacher showing up and wanting to have them go off on a search. Picard declined so the teacher went off by himself. His ship was subsequently destroyed. It was found that there were about seven genetic clues leading to a planet. The Cardasians, the Romulans, the Klingons, and the Humans all had parts of the puzzle. When Data and Geordi figured it out, they and all the other ships descended on that place. As they all stood, guns drawn, confronting each other, Dr. Crusher scraped a bit of lichen from a rock and added it to the seven in her tricorder. The combined data from the genetics reprogrammed the tricorder and a hologram of a woman appeared. She was bald, and had only earholes. She wore a long white dress (a shift).
She explained that millions of years ago they had evolved and searched the galaxy for other sentient beings but found none. They, being extremely advanced, seeded many worlds that already had life on them with their own genetic material including DNA instructions to guide evolution toward their own species. While each world incorporated some of their native genetics, they all developed into versions of this original sentient species. As such, they were closer to each other genetically than, say humans are to chimps. As such, they were able to mate. However, the concept of all the different humanoid species there being related thoroughly upset them, especially the Klingons and the Cardasians.
So, I hope this takes care of disbelievers like George and Doug. :tongue:
Sorry, Mriana. I don’t recall that Spock was conceived in vitro. I got the impression that his father and his mother were very close, and that included physically.