dellac said: If it is a colour-blocker it should be great for breaking orange dominance?
Only if the resulting progeny have
active color blocking gene(s) for that particular orange gene(s) that a lily may have. I don't think anyone actually knows how color blocking works, only that it does. It stands to reason that there would be multiple color genes for orange, multiple genes for yellow, etc. Similarly their could also need to be corresponding color blocking genes for each. There's a lot more (not well understood) things that can go on besides simple Mendelian genetics, too. A lily may actually have a dominant color blocking gene, for instance, but for whatever reason, it is still not outwardly expressed. In fact, I don't even think people know for sure if there are dominant and recessive color blocking genes at all.
