Personally, if I can come up with a reasonable way to drop the term "Hypomelanism" completely, I will do so. It covers way too many similar looking genetic traits for me to feel comfortable even thinking of that term. It has now become a rather generic term basically meaning a lighter colored cultivar, but not necessarily a reliably identifiable single genetic trait. I would have to say that breeding anything Hypomelanistic to another Hypomelanistic has the potential of producing unpredictable results.
I think the first Hypo Lavenders I produced were back in 1996. Crimsons sometime before that, I believe, and of course Ambers back in 1995 or so. I have had one form of Hypo or another around here since around 1988. Prior to getting those Sunkissed Corns from Kathy (sorry, I don't remember when that was), the only other stock I have added into my colony from anyone which had the likelihood of carrying a Hypomelanistic gene of any sort was the Ultra Hypos from Mike Falcon. And I kept them genetically isolated from everything else except for a test breeding to one of my "regular" Hypos to see if it was the same gene.
Now the weird part about that Ultra Hypo test was that when I bred my one male I had at the time to that regular Hypo female, I got all Hypos, so I just figured it was a slight variation of regular Hypo and didn't think much more about it. Later on I bought another rather pretty Ultra Hypo male from Mike Falcon but only bred him to the only original Ultra Hypo female I had for a few years. Well, last year I bred this Ultra Hypo male to one of my Amber corns, after seeing what the Ultra Hypo line did for the Ambers that Mike Shiver was working with, expecting to get all Hypos het for Caramel. Of course, I got all normal colored snakes out of that clutch. Not a single Hypo at all.
So is this second Ultra Hypo male different genetically from that first Ultra Hypo male I had? Well how could it be since breeding it to that original female (which was a sibling of that original male) has produced all Ultra Hypos? And I had already determined early in the game that Ultra Hypo and regular Hypo were the same gene? The only logical conclusion is that somehow that Amber I used is a different genetic line of Hypo. But as far as I can remember, ALL of my Ambers came from a breeding of my original regular Hypo male to a couple of my Caramel females.
Now I did have another Hypo line crop up in my Miami phase line. Matter of fact, it was from the line that my Silver Queen Ghosts came out of. But again, I test bred this line (I have been referring to them internally as my "Scarlet" Hypos) and all babies came out being regular Hypos. Matter of fact, I have bred regular Ghosts to the Silver Queen Ghosts and gotten all regular looking Ghosts as a result. However, I did breed the Scarlet Hypo line into the Lavenders early on, but as the above results indicate, this SHOULD have still been the same line of Hypo I had been using all along. This is the ONLY instance I can recall where an offshoot line of Hypo, that came from separate stock from my original Hypo male, got bred into the Lavender line. But all indications were that it was the same gene at that time.
See what I mean? This stuff just doesn't make any logical sense at all.
And I was only worried about the Sunkissed line when I discovered it was a new Hypo gene! Little did I realize just how muddy the water had already become. And as has been proven to me (ala a 2x4 smacked into my forehead with the 'A' Anerythrism gene), once you have a gene in your colony for more than a couple of generations or so, you will NEVER be able to get rid of it. Anerythristics pop up in the darndest places these days.
So multiple Hypo genes are here to stay. How many snakes do you think I personally sold over the years before I even had an inkling about this problem? Lots and lots of them.
Anyway, this all is giving me a headache. And now another breeding season is breathing down my neck. I do not have any high hopes of getting answers to the questions, but fully expect to get even more questions as the babies begin hatching.