I've been looking at pied genes and I was wondering if someone could help me with a question I can't seem to find an answer for.

When it comes to pied percentages (like a high white or a low white) is that genetic? Or is it just random what the babies will get. I've noticed a high white pied sells for more than a low white, but is that just for appearance, or is that because their babies will have a higher probability of being high white?

Thanks,
Dustin