The Sugar is a dominant morph that was first proven genetic in 2002. They are notably characterized by their white sides and varying degrees of "black back". Some sugars have lots of white on their sides , while others are just peppered with a few white scales. Though a somewhat subtle base morph, Sugars are an integral ingredient for some of the boldest designer morphs ever produced.
The Lemon Blast Sugar and BumbleBee Sugar are two of my personal favorites.