Ggg Leopard Geckos
The name tells you which line produced the animal, which is Golden Gate Geckos' Bold Stripe line known as GGG. It was built up over many generations to create a stronger stripe with more contrast between the dark lines either side and the light back.
About the Ggg gene
Marcia McGuiness built the GGG line over many generations of selective pairing. This named leopard gecko line is Golden Gate Geckos' own take on Bold Stripe. Her Bold Stripe work is well enough regarded that other breeders have drawn on it to start their own projects. When you buy a GGG, you are buying into the line's reputation for contrast as much as the pattern itself.
Appearance
The Bold Stripe pattern is what a GGG carries. It has a band of light ground colour down the middle of the back that is pattern-free, with lines of dark patterning on either side instead of the usual banding. McGuiness bred her line for high-contrast markings. Because of this, the dark lines and the pale stripe beside them sit further apart in tone than a typical Bold Stripe.
Genetics
Rather than a single gene, GGG is polygenic. It descends from the Bold and Bold Stripe traits, which are also polygenic. The pattern comes from selective pairing over generations instead of one Mendelian locus. What a buyer is really paying for is the line's history rather than a genotype. Because Golden Gate Geckos did not pair animals back to their own siblings or parents, it took years for the look to become consistent. Ggg or Pos Ggg is how the catalogue lists it. No complex or allelic partner is documented for it. Morphpedia names Bold and Bold Stripe as the proven relatives of the line.