Totally random...lows produce highs and highs produce lows...you can take 90% whites and get 5% every time...its the luck of the draw....it is genetic marker and not a trait.
Ask any large breeder that has been messing with Pieds since the day they were discovered.
Peter Kahl was the first back in 1997 and the description is as follows: Quote from "World of Ball Python Morphs"

"Piebald - Piebald is a recessive trait that is partially un-pigmented with variable color and pattern mutations. Piebalds express an unusual cloud-like pattern unseen in any other base-morph. The amount of white is not indicative of its parents’ color. For instance, a 90% white piebald bred with a 90% piebald, may not produce 90% white offspring. The amount of white is typically a random occurrence. Pieds are a color and pattern mutation with an aberrant body pattern while the head is typically normal looking. Although some have confused ringers with pieds, there are some distinct differences."

Quote from Tony Gude

Travis
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LAIR OF DRAGONS

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