Daniel_J

My answer is: No, from ordinary social life point of view. AND yes, there is difference from biology/physiology point of view. The difference is just too too too tiny, and not necessary to discuss in our daily life. Commercial information removed by moderator

1. Mutation. 2. Selection. Can be nature but for blue eye it does not seems to have a strong proof. Human selection: possible, maybe the blue eys want to have children with other blue eyes. Then the gene stablized in the community. 3. Not-too-bad gene. Well, if it is too bad then it will be eliminated from the nature. Extention of 2.

I think as sci-fic, you can assume some fact and develop a story. Not necessary to follow everything of the sciences.... Like <Silent Sea>, the author assume there is a type of water can be expended like virus. Well, the fact is bull-Sxxt, but the story was funny. DNA - do you want to assume DNA has 3 chains, or with a new base. Just do it, as long as the story is nice then I buy it.