I always find it irritating when writers use a character’s genetics as an excuse for how they have magical powers. Our intrepid heroes, having been exposed to cosmic rays or sea slug stem cells or something, find that they now have the power to turn invisible, make things float in the air, or even set things on fire with their mind. Setting aside the fact that changes to the genetic structure of a preexisting creature do not cause the creature to suddenly morph accordingly, there’s still the problem of physics. All of these special powers violate some vital law of physics, usually Newton’s third law or the first law of thermodynamics. These laws aren’t coded into your genetic code, just waiting for the right gene to come along and ignore them. They’re hardcoded into the universe itself.