What type of gene dominance does the Yellow Belly trait exhibit in ball pythons?

Co-dominant

The Yellow Belly gene operates under a co-dominant mode of inheritance. This classification means that an animal only requires the presence of a single copy of the Yellow Belly gene to visually express the trait. If an animal inherits two copies of the gene, it becomes a Super Yellow Belly, which often presents an even more pronounced expression of the desired traits, although distinguishing a Super from a single-gene carrier can sometimes be challenging without verifiable pedigree information. This contrasts with recessive traits, which require two copies to appear, or simple dominant traits, where inheriting one copy maximizes the visual effect without a distinct homozygous form that offers further intensification.