I should also elaborate a bit that it isn't quite which gene that's causing the white, it's the whole package that causes that white.
If you remove any of those listed genes, the animal can look amazingly different. The pastel on top of the enchi butter/lesser blade clown will definitely add more white, but you won't get that end look without all 5 genes at play. Without the pastel you will still end up with a yellow snake with some white a little further up the sides.
Lesser will reduce the black to brown and start bringing in the white sides.
Clown changes the pattern
Enchi brings in a cleaning effect of sorts, brightening the yellows and enhancing the dorsal pattern.
Blades further reduces the side patterns and helps bring up more whites from the belly
Pastel further enhances the color and brings more white on the sides.
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