When Qui Gon Jinn (Liam Neeson) is speaking with Anakin's mother about her son and questions Anakin's paternal history, Anakin's mother responds with, "There was no father. I carried him. I gave him birth. I can't explain what happened."
I don't know how I had missed that previously when watching this film. The writers turned back into some of the older human mythologies and gave Anakin Skywalker a virgin birth. Unlike mythological people from various ancient religions, where a god or some other mythical creature impregnates a human, they wrote this history for Anakin to be one where he may (they don't make it certain) have been sired by the midi-chlorians (the fictional sub-cellular organisms which inhabit the cells of all life in the Star Wars Universe and who are the supposed source of The Force; their name seems to come from mitochonria and chloroplasts, our endosymbiotic subcellular organelles). I think it's interesting that they decided to go this route with the character. Giving him a virgin birth story makes his character seem more superhuman that simply "in tune" with his universe, like most Jedi are.
I find it interesting that the prophesy that Qui Gon thinks Anakin is to fill, being The One who will bring a balance to the force, ends up being one who pretty much destroys everyone who has great understanding of the force. Outside of the ideas of good and evil, light and dark, and such that permeate the story of Anakin Skywalker, perhaps his virgin birth could be taken to be something deeper in the story of this prophesy. This is all just food for thought, but I leave it here with a quote from George Lucas on the subject: