Origin Story: Evolution has taken another bold step forward for humankind, resulting in a bizarre new species that possesses claws, metallic skin and unstoppable crime-stopping powers. A bald paraplegic mutant named Charles Xavier founds a school where mutants can learn about their powers, wear spandex outfits and prevent mutant super-crime on a global level.

Comic Book Consequences: The X-Men are born! Much like a football team at a human school, the X-Men's line-up changes periodically as students graduate and decide to star in spin-off adventures, blasting off into other galaxies to fight space-based mutant super-crime or traveling to the future to battle mutant super-crimes that have yet to be, or interning at Pillsbury. (Charles Xavier's School For Mutants has a robust outplacement program for graduates.)
Other students, like Wolverine and Cyclops, stay on as associate professors, fighting one another for choice teaching positions and clawing for tenure.

What Would Have Happened in Real Life: Since mutation happens at a chromosomal level in small, random increments over countless generations, Professor X's mutant school is populated less by telekinetic fire-throwing demi-gods and more likely by one kid with a slight bump on her back that, after a few hundred thousand years and with the help of Professor X's well-funded breeding program, blossoms into a non-working bat-wing. Professor X's successor happily sends his mutant out into the world to fight crime and battle prejudice. She is promptly shot attempting to stop a bank robbery by flapping her little bat-wing.