Which specific colors are dramatically increased and saturated by the Yellow Belly gene's effect on ground color?

Yellows and oranges

The most striking physical characteristic imparted by the Yellow Belly gene is the dramatic enhancement of light coloration, specifically manifesting as vibrant yellows and oranges. When comparing the light-colored areas, known as the ground color, on a Yellow Belly to those on a non-hypo Ball Python, the difference is marked by significantly greater saturation and brilliance. This enhancement is often described as luminous yellow or rich orange hue in the lighter sections. This high-key illumination across the body is often the primary visual cue that allows keepers to immediately recognize the morph, even among a clutch of hatchlings, because it provides a much cleaner and brighter overall appearance to the snake.