Originally Posted by Chiilaa
I think that there is something more going on. Why don't every frame or splash have blue eyes? Something else must be involved.
It's the same with Vienna rabbits. Not every Vienna (Heterozygous for Blue Eyed White, which is Homozygous) has blue, or partial blue eyes. Some have brown eyes and Vienna markings. Others (like my breeding stock) have full blue or partial blue eyes and white markings. Sometimes the brown just overpowers the blue, the blue hides under the brown
(I had one buck like this, his eyes where 'marbled') or the blue eyed gene just didn't 'click' at all, even if the horse carries it.