The "palmetto" gene is said to be a type of leucism. That they would produce "tan" offspring is interesting (wellto me
), as "Rusty" black rats are the visual "morph" for leucistic black rats, (the Texas rat line of leucistic acts as a recessive) Maybe there's a link between leucistic colubrids and visual hets. And you know nobody's breeding Palmetto's to normals, but het to het breedings are surely going on enough that you'd see pictures.