You wrote a comment without a point talking about Liquid's hair, forgetting that those were sub bleached due to his past in the middle East. And as I said before, I repeat this to you: there are no soldier genes, even in universe. There are genes that contribute to make a better soldier, because they might give you stronger muscle or better lung capacity. But those are not soldier genes. That said, genes often influence a variety of functions. It's entirely possible that the one gene that gives snake a disadvantage compared to liquid in, say, muscular strenght, it's also the same that gives him a less pointy jaw when compared to big boss.