FAQ: if blue1 and blue2 are alleles of the same gene, is it possible that each allele (blue1 or blue2) has its own specific alleles?
I am afraid not. That is why I mentioned in my article of April 2019 and I quote: “As mentioned before it is generally assumed that both genes, both blue type1 and blue type2, are located on the bl-locus. Yet there are some indications that we might be dealing with epistatic genes.”
Besides that we don’t know yet how the different genes, that affect the production of psittacofulvins, interact towards each others. This is still poorly understood.
So again: the only way to find an answer on these questions starts by DNA analyses and believe me, we are working on it