I think the underside of the tail (banded or solid) may be codom or dominant.
My banded amel has solid underside color to her tail. When paired with a WC banded from way out of striper range, about half of the offspring had solid color under tail and half had banded under tail.
Pairing cal kings that only have banded under tail produced young that were only banded under tail.
I don't have enough data to even say that my suspicion about *that part* is accurate, but when pairing cal kings, I always check the underside of the tail just to see if the pattern follows, to see if *maybe* it is a single gene controlling it in a predictable manner.
I've also noticed that some of her offspring, at some places the black stop short of the belly on both sides leaving completely cream at that spot - and I wonder if that is a visible indication of a striped ancestor as well, even though from the top they visually are as banded as banded come. I can't recall ever finding a wild norcal banded like that - but I only just noticed it, so I haven't been specifically looking at their bellies for it.
I don't know jack about what goes into patterns, and I think some aberrant cal kings are different than the aberrant that results from stripe x banded (IE the black belly aberrants that are found in the valley far away from stripe range living in populations that are otherwise banded) but it is something that interests me, I hope someday someone figures it out.
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