A plague infects Earth. Nobody knows what it is or how to stop it, except people with green eyes aren’t affected. What happens to humanity, and what happens to those green-eyed people?
Mercenary Proofreader is slightly offended by the (possibly unintentional) implication that people with green eyes and humanity are separate groups.
Mercenary Proofreader can hazard a guess about what would happen to a small minority (only two percent of the population) who showed immunity to a disease that was killing everyone else, and it wouldn’t be good.
To the best of Mercenary Proofreader’s knowledge, there are no traits linked to having green eyes that would make people having that eye color immune to diseases that affected every other human (and, being a green-eyed person as well as having an interest in genetics, Mercenary Proofreader would have noticed if science discovered such a link). Green eyes aren’t like type-O blood (see above reasons for noticing), which does confer resistance to certain diseases (bubonic plague, for example… although it also makes us a bit more susceptible to catching smallpox, even if we do have a better-than-average chance of surviving it). Not that you care — you’re just here to learn about grammar and punctuation and stuff, right?
(“Experts” who believe a person with autism cannot have knowledge or interests outside a very, very narrow range of “splinter skills” of no real use and without application to real life can kiss Mercenary Proofreader’s ass.)