Leopard geckos are mostly line bred for certain traits. This means that geckos that have patterns and colors you like are bred together to try to refine the trait (get more intense color and/or pattern you origionally liked in the parents). These traits are controlled by more than one gene on likely more than one chromosome.

Leos do have one type of trait that is more predicatable. All three strains of albinism are recessive traits (Tremper, Rainwater and Bell, named after the people who first produced them). To actually physically show this trait the gecko must have two copies of the recessive allele (aa), one from each parent(allele = fancy word for a variation of the same gene, i.e. T=tall and t=short, both describe the same trait of height determined by one gene).

If your interested in albinos, buying a gecko that is heterzygous for albinism (Aa, one dominant gene and one recessive gene) is the cheaper option or you can purchase a full albino (aa, two recessive genes) and breed it to your female to produce all heterzygous offspring (your female is probably AA and would give her dominant gene for non albino and your full albino would give her recessive 'a' to produce all Aa babies. Of course if your gecko produces and albinos you've lucked out and already have a het female....

Okay, if that was too much thinking on a saturday I apologize. I realize most people know about the basic working of genetics but I have it from a close source that turtlegerm hasn't taken genetics yet