Again, all you can do is treat people as fairly as possible by basing admissions policies on merit and standardization, rather than sloppily basing them on perceived group identity.
Where does the talk about genetic variation and unconscious bias even come from? It's not relevant in this context.
I 100% realize that there is massive variation in high school quality. It doesn't astound me. [1]
What does that have to do with making college admissions fair and standardized?
[1] http://foxbaltimore.com/news/project-baltimore/6-baltimore-s...
Another ground breaking discovery! Everyone has equal opportunity in this world. Poverty, discrimination and access to quality education are completely fictional. Keep these thoughts coming man, I'm writing you up for the Noble Prize.