How does the Yellow Belly gene interact synergistically when combined with the Fire gene?

The Yellow Belly clarifies the pattern while the Fire brightens the base color

When the Yellow Belly gene is introduced into a Fire Ball Python, the resulting interaction is described as synergistic, meaning the genes amplify the best qualities of one another. The Fire gene is known for already increasing the brightness of yellows and reducing black pigment, contributing to an overall lighter appearance. The Yellow Belly complements this by providing pattern clarification and enhancing the overall clean look. This combined effect results in an animal that is exceptionally clean and bright, showcasing an amplification of both the base color intensity and the sharpness of the pattern delineation.