Remember!
EE/Aa/Dn is a quicker way to say the creature has two "E" or black/eumelanin genes, one "A" or red/agouti gene, and one "D" or dun gene
When explaining genes in this guide, the _ symbol will be used to note that the gene in that slot doesn't matter visually, because the gene listed is assumed to be dominant
ee/_ _ means that the genes in the "a section" can be anything in the "A series", and the creature will still look the same visually (in this case, red).
Complete Genotypes for characters should always list some form of ee/aa, because these tell you what color the base coat is, but additional markings can be left out if they only contain n "null" genes (so you don't have to write Ee/Aa/nn/nn/nn/nn/nn/nn... )
Several different genes can cause fur and skin to stop producing color, called "white spotting" genes. Each gene affects different areas of the body and behaves in different patterns. Most white patterning genes are all Codominant and appear together on a creature. White patterning genes cover almost all other marking series and mutations.
In addition to this, there are some genes that can interfere with white spotting genes, and allow color to "come back" to areas that white spotting genes would otherwise have removed color from.
These markings each are their own "series." A creature have up to two copies of each gene here without any conflict. Meaning, they could for example be SplSpl/RbRb/ZeZe, and therefore have two copies of Splash, Rabicano, and Zebra genes each.
(Though be advised that some genes, like Overo, are fatal if two copies of it are inherited)
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!
One gene is inherited from each parent. So if one parent is ToTo (two copies of Tobiano), and the other parent is SbSb (two copies of Sabino), the offspring can only be ToSb (one Tobiano from the dad, one Sabino from the mom). If one parent is ToRn (Tobiano & Roan) and another is SbW (Sabino & Dominant White), then the offspring could be ToSb, ToW, RnSb, or RnW.
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.
Ticking genes only affect white caused by white spotting genes listed on this page. It "cancels out" the white in various ways, allowing the creature's original colors to show. If there are no white spotting genes present to affect, Ticking genes won't be visible, but can be carried and passed on to offspring.
These genes are all part of the same series, so a creature can only have two at most. Ticking genes are codominant, meaning having more than one will show the effects of both.