How easy is it to visually differentiate heterozygotes carrying one YB series allele crossed to wild-type?

Extremely hard to visually differentiate from a normal ball python

A significant challenge for breeders working with the Yellowbelly series is the subtle expression when only a single copy (heterozygous state) of any of the five known alleles is present and crossed with a true wild-type snake. In these heterozygous instances, the visual differentiation from a standard normal ball python is extremely difficult. While some experienced keepers might notice a marginally lighter underbelly, this characteristic is highly variable and unreliable, especially concerning the milder alleles like *gravel* or *asphalt*. This subtlety often leads to situations where breeders might mistakenly identify a carrier snake as normal, potentially resulting in unexpected pattern clean-up or subtle modifications in subsequent offspring generations.