Very interesting discussion. Makes the phal I bought as a semi-peloric look absolutely normal, obviously a very 'light' mutation.
I am not a geneticist, but from what I remember in university, there could be several reasons for the variation one sees in the expression of a certain genetic trait. I won't even try to get into it here, mostly because I'll be only partially correct. Likely there are multiple genes involved. Depending on their respective dominance, and penetrance, there can be variation from year to year. Stable plants have had these issues cleared up by repeated selective breeding.
Stephen
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