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.

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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.