Leucistic sugar gliders have white fur with black eyes. They also have very clear, or translucent, ears. This color is either completely displayed, or not present. In other words, two alleles must be present for this recessive gene to be phenotypically (physically) displayed. Example: Breeding any 100% LEUCISTIC HET (heterozygous) to another 100% LEUCISTIC HET (heterozygous) can produce Leucistic offspring (LEU + LEU alleles).
Leucism is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair, or feathers during development. This results in either the entire surface (if all pigment cells fail to develop) or patches of body surface (if only a subset are defective) having a lack of cells capable of making pigment.