Thanks Sonoran, I just like to learn and I learn best from pulling things apart and then re-building them. Maybe this is a good approach to take with the paints.
First things first, test at the dominant white locus , as you have started with your mating to dun. But I see in your signature that you have kahki, these birds would be even better as it would only give the outcome of I^D/?. The ratios of segregates would tell you huge amounts. and dependent on these results you look at the next step
then look closely at the black (and maybe white) segregates from paint breedings. (this is where I do differ from most others)
Mate them to other diluters that are and aren't at dominant white locus. Blue and sex linked choc would give you some clues in the F1. Lav would be another but one would have to wait and be patient and dilegent by creating the classical F2 test.
IMO by doing this you may well even see differences in 'paint expression' from the differing diluters (that aren't dom white) in that blue leaks in much the same way dom white does (also dun maybe?), yet not lav and sex linked choc, even down to the mode/action that these alleles and gene pairs cause at a cellular level, therefore one may see consistencies at the phenotypical level make more sense.
This helps explain (IMO) Sigi's observation of the loud expression of the splash paint and a poster in this threads experience from inreasing spots from mating paint to paints
Therefore in th flip side in the range of diluters..
... would a lav paint be lav with darker lav spots? or black spots,, if the latter option/possiblity is the case, back to the cellular level..and extralopalting/hypothizing further would a 'I^P/I^P', c/c bird be the ulimate black and white paint? (yes, in that I mean a recessive white paint). Just some thoughts.
But back to dominant white, it's clear that it has involvements and I/i+ birds have the paint phenotype along with I/I^P birds but rather than causing it(paint pheno), it (dom white) allows for 'paints' expression (ie visible in pheno) and adding to the headaches as they are phenotypically the same as an I/I^P and an I/i+.
So Sonoran I dont argue with your proposed order of dominance further back rather that a I^P/i+ - with no other diluters is esstentially black with black spots..you need a diluter to see 'I^P''s expression. This in turn would support Sigis statement at the coop in the earlier paint dicussion thread that: black to black = black it doesn't mean that they aren't I^P!
It all just hangs on if there is I^P, I reckon it's there, it just needs to be teased out from I.
Kudos and reward would be there for those that are willing to fill in the gaps in the genetic roadmap
