It's a good plan, in fact a great one....but who is the one out there with a pure ultra, no hets? I think this upcoming year there should definitely be an attempt to cross ultra purely to amel, I know there are people out there with amels that have been tested not het hypo--good start. I'd love to see the testing of such a cross, it'll help prove/disprove the theory. That's where we are now. We have a working theory that seems to fit the data presented.
In the ideal world we wouldn't have the other genes mixed in, we'd all have pairs of pure one-gene corns sitting on the shelf waiting for a chance to be used as testers, we would have started with ultra popping up by itself and tested it out before it got all mixed in with caramel, motley, amel, hypo and the lot. Unfortunately, we've got to work with what we've got. Makes it more fun, I guess.
Looking back at the spreadsheet, there are several crosses where ultra has been crossed with snakes that have no reason to ever have ultra in their backgrouds.
What do we need to cross? Well, I'd like:
Ultra x amel
Ultramel x amel
Ultra x normal
Ultra x het amel
Ultramel x het amel
And what I'd think would prove it: Breed an ultramel to a normal (no hets), get all normals, test cross the F1's to find they are all either carrying amel or ultra, but not both. Unfortunately this takes generations and a lot of back crossing of a lot of individuals...but it'd nail it. Preferably this cross would be started with proven non-hypo A carrying individuals.
On the note of crossing to a pure amel...look at the opal cross (24). No lavs popped out on that one, so the ultra isn't het lav and ultra isn't allelic to lav. It becomes a non-player and seems to have no influence. That leaves this cross as a "pure"
ultra x amel...the cross we're wanting to do (and still should). Ultra x amel = all ultramels. No amels, that individual isn't het amel...hey, the perfect male to cross on some plain hypo-less amel.
And ultra motley crossed to a bloodred gave no bloods and no motleys, so here's your
ultra x normal crossing. Result = all normals. It's not dominant or codominant to normal. That leaves us with pure recessive and/or allelic to a known trait.
We need an ultra x normal het amel, I don't see one here. Expected results: Normals and ultras.
We need an ultramel x amel as well. I suspect there was that cross in shivers ultra x butters and caramels, but he didn't give full info.
ultramel x het amel - ultra caramel x caramel motley het amel (14). Drop the caramel, they both have it and it doesn't effect the gene (19). Motley has already had no effect in other crosses, so the result is an ultramel (since butters and amel mots were produced) x a het amel. Results were amels and ultras as well as non-amel/ultras.
It's not compatible with hypo A (13,16), sunkissed (2), or lava (3), bloodred (20), lavender (16,24), anery (23), caramel (19), motley (19, 20,23). Guess we need to cross it on charcoal to be sure, but most of the genes are represented in the body of evidence so far.
In every instance where an ultra has been bred to an amel or het amel, ultras have resulted (4, 9, 10, 11, 14, 19, 21, 22, 23, 24).
I fully agree, we need to do the test crosses to prove we can get what we think we should...but if you look at the data and interpret it, most of the info is there.