Molly flicks her hand again, though she has to do it twice before the shield slides fully closed around her arm; still, it's a gesture of 'eh, well...'.

"Depends on your definition of inheritability. It's not difficult to map the likelihood of the mutant gene getting passed on, but what powers that switches on are pretty idiosyncratic. It's a bit like personality - you might get bits from your parents, or you might be like neither. My mom and dad both had the glowy pink eyes like me, though."