The belly has to be completely devoid of checks.
Some show the circle-back pattern, but you can have a motley that looks normal from above and the only way to tell it's a motley is by looking at the belly.
It is a simple ressive trait.
-----
alstiver@hotmail.com
1.0 2001 Coral snow cornsnake
0.1 2002 Pastel Ghost poss Het Amelanistic cornsnake
1.1 2002 Bloodred cornsnakes
0.1 1998 Het Hypo, Het Caramel cornsnake
1.0 2000 Hypo Het Caramel cornsnake
0.0.13 2004 Eggs (potentially normals, hypos, caramels, and ambers)