First of all let's get on the same page terminology page:
Leucistic: Does not exist. What I believe you are talking about is a Patternless Leopard Gecko. This is the correct, accepted term for what was misnamed a long time ago. Just like scientific names change from time to time to better reflect the organism, Patternless is the best description for this animal.
Genetics:
The Patternless trait is a recessive trait. That means that in order for the trait to be expressed (be visible) it requires both pairs to be present.
So.....
When you mate a Patternless (or Blizzard or Albino) to any other animal that does not have the Patternless trait, you will get normal looking babies.
Steven-LGGG
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Steven
Royal Gold Reptiles
Offspring available now from LV Patternless Albino stock for '03 and '04.
Working towards Bell Patternless Albinos for '05.