During the holidays, Christians celebrate the birth of a human baby to his virginal mother. We know that female wasps, fish, birds, and lizards can produce healthy offspring without having sex, but what about people? Are natural human virgin births possible?
Yes, in theory. However, a number of rare events would have to occur in close succession, and the chances of these all happening in real life are virtually zero. For a virgin to get pregnant, one of her eggs would have to produce, on its own, the biochemical changes indicative of fertilization, and then divide abnormally to compensate for the lack of sperm DNA. That’s the easy part: These two events occur in the eggs or egg precursor cells of one out of every few thousand women. But the egg would also need to be carrying at least two specific genetic deletions to produce a viable offspring.
