Re: HYB: ?heredity of orange questions?

Thanks for going over all of that (again?), Chuck.
But I'm still not sure I understand how orange is inherited, or rather how to guestimate probability of getting orange from various types of crosses.
Paul's version is easy (easier!) to understand - pink is recessive to orange which is recessive to yellow.
But I'm still confused as to whether there are <two> or <three> sets of genes at work - tttt and carotenoid yellow (i.e., absence of reduced carotene genes) <or> tttt, yellow , and a third thing that causes partial yellow <and> tttt to give orange? 

Not to forget reduced anthocyanin set of genes
Maybe my brain is simply not quite ready to wrap around this one yet. I may have to wait & see the babies bloom.... 
--
Linda Mann east Tennessee USA zone 7/8
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