I am trying again to restart this discussion, which is related to my question.
I also don’t know enough about corn genetics, and something intrigues me.
Why do the cobs of corn in some populations have uniform grain colors but with variations in hue from one plant to another, while in other populations each grain has a different color?
What will happen about the colors when these two populations are crossed?
Are some colors dominant and others recessive? Even if you don’t have a scientific explanation, tell us about your experiences. 
example :
1/ Painted Mountain flour corn population
2/ North italian flour / polenta corn population (thank @marcela_v for this picture taken at a local seed exchange in Italy)
