Ball pythons don't seem to read the books where we made up the cut and dry line between recessive and co-dominant (or incomplete dominant some say). In my experience both pied and hypo are "recessive with co-dominant tendencies". I've proven 3 possible het pieds (two of them only 25%) and two possible het hypos all picked on pretty clear markers. I'm not saying its 100% but it can be very useful when picking from a clutch of possible hets. I'll try to get a picture of my het hypo female in glow today as she is always light but in pre-lay glow she looks like a ghost. Some het hypo's even shed clear like homozygous hypos.