All of the genes in the KIT series connect to the same locus, meaning creatures can only carry two of these genes in a series at most. For example, they can be ToSb (ne Tobiano and one Sabino gene), Sbn (One Sabino gene), or SbSb (Two Sabino genes). But they can't be ToToSb because that's too many KIT genes!
They are codominant, meaning that if a creature carries two different KIT genes, the effects of both will show. Having two copies of the same gene generally causes it white from it to cover more of the body.
Speckled white starting on the underbelly and head and spreading up to cover the rest of the creature's body, may appear mostly solid or laced.
May display mapping, thin roaning around the white markings.
Skin is pink where affected by Sb.
May cause blue eyes.
In hooved creatures, mane and tail are white where skin beneath is affected by Sb.