Why "intuitive"? It seems far from obvious that they'd be different when they come from the same sperm and egg cells. Does "anyone" really think that? I, who's

Why "intuitive"? It seems far from obvious that they'd be different when they come from the same sperm and egg cells. Does "anyone" really think that? I, who's well more versed in sciency things than the average although I never really thought about this particular subject, would have guessed that they have the same genetic code. So yes, I'd guess that a big proportion of people would think that