Technically speaking a Leucistic boa should be entirely white, so even if it had another mutation it wouldn't be visible, unless it did something odd to the eyes. For instance an Albino Leucistic rat snake has red eyes.

Leucistic in rat snakes is recessive, however if it is co-dominant like Ball Pythons it could always make a cool morph in the heterozygous form mixed with something like a Motley for example. A Super Motley het Leucistic may look different, a different color than a Super Motley (like the stillborn Hypo Super Motley that was red).

Leucistic snakes by definition are achromatophoric, just like amelanistic boas have no black, or anerythristics have no red, the chromatophores (sp?) in Leucistics don't function, or aren't there, or something is wrong with them. Chromatophores allow pigments to be shown in snakes. (there is a really good explaination in VPI's Ball Python book, I don't want to get to much into it because I do not want to give the wrong information.)

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