Note: These are all based on real-world rat genetics. As such, there are multiple genes that cause certain mutations (i.e. the three "Rex" genes).
Keep in mind that all these different genes listed interact in a lot of different ways--even though it says non-agouti on the A Locus is usually called "black", depending on other genes it can turn that "black" rat to a lot of pale colors--even white!; this list is provided mostly so you can get an idea of what your character is carrying.
I'm sorry that there are no pictures for this section, but I simply couldn't find enough CC pictures of the various varieties to make this complete. Don't worry, though, images of the various types are only a google search away.
A Locus
A | Wild-type Agouti
Agouti hair has several different bands of color as it travels up the shaft of the hair. If no other modifiers are present, this is the classic "wild-type brown" rat.
am | Melanistic Agouti
This extremely rare gene creates an agouti rat, but the overall color is darkened noticeably.
a | Non-Agouti
Non-agouti hair is one solid color as it travels up the hair shaft. If no other modifiers are present, this creates an entirely black rat.
B Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
B | Wild-type
b | Chocolate
M Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
M | Wild-type
m | Mink
D Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
D | Wild-type
d | Russian Blue
G Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
G | Wild-type
g | Slate Blue
C Locus
This is the albino locus. It also controls "shaded" patterns. These patterns are expressed on both agouti and non-agouti rats.
C | Wild-type
ChCh | Siamese
Chc | Burmese/Himalayan
c | Albino
R Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
R | Wild-type
r | Red-eyed Dilution
P Locus
To see how this modifier combines with agouti/non-agouti and other loci, please scroll down to the Special Section on Colorations.
P | Wild-type
p | Pink-eyed Dilution
Oe Locus
Oe | Wild-type
oe | Odd-eyed.
Each eye is a different color.
Li Locus
Li | Wild-type
li | Lilac
Only expressed on Mink rats. This changes to coat to a light lilac color.
Special Section: Colorations.
Simple Agouti Colors:
A-bb | Chocolate Agouti
Similar to agouti, but with very little black. The base color is also a much richer shade of brown. Eyes will be dark.
A-mm | Cinnamon
A warm, deep red brown color with dark greyish undercoat. Eyes will be dark.
A-dd | Russian Blue Agouti
Dark gray with orange/tan ticking, may have dark guard hairs. Eyes will be dark.
A-gg | Blue Agouti
Slate blue base coat with tan tips and black guard hairs. Eyes will be dark.
A-rr | Fawn
Deep orange, may be paler gray at base. Eyes will be ruby.
A-pp | Amber
Light orange/fawn. Eyes will be pink.
Simple Solid Colors:
aabb | Chocolate
A warm rich brown. Eyes will be dark.
aamm | Mink
A deep, very cool shade of brown with a grey tint to it. Eyes will be dark.
aadd | Russian Blue
Deep dark dusty blue, may have dark ticking. Eyes will be dark.
aagg | Slate Blue
A slate blue color, slightly lighter than Russian Blue. Eyes will be dark.
aarr | Beige
Tan, cream, or buff. Eyes will be ruby.
aapp | Champagne
A paler, creamier shade of beige. Eyes will be pink.
Complex Agouti Colors:
A-bbrr | Topaz
A deep orange color with a pale grey undercoat. Eyes will be ruby.
A-mmgg | Platinum Agouti / Blue Cinnamon
A pale platinum with tan to orange ticking. Eyes will be dark.
A-mmRr | Havana Agouti
A warm, light red brown color with pale greyish undercoat. Eyes will be dark ruby.
A-mmPepe | Cinnamon Pearl
Pale fawn color with a cream undercoat and blue center on hair shaft. Silver guard hairs. Eyes will be dark.
A-ddrr | Russian Blue Fawn
Ticked light grey and fawn with red. Eyes will be ruby.
A-ggrr | Platinum Agouti / Blue Fawn
Light slate blue base coat with cream tips and dark guard hairs. Eyes will be ruby.
A-ggpp | Silver Agouti
A light grey color. Eyes will be pink.
Complex Solid Colors:
aabbRr | Cocoa
A warm, soft cocoa shade. Eyes will be dark ruby.
aammdd | Dove
A light, vaguely-purplish grey color. Eyes will be dark.
aammgg | Platinum
A very light grey color. Eyes will be dark.
aammRr | Havana/ Ruby Eye Mocha
A light, warm brown color. Eyes will be dark ruby.
aammPepe | Pearl
Creamy silver color to pale gray. Hairs tipped with cream or silver, gray guard hairs. Eyes will be dark.
aaddgg | Russian Silver
A bright silvery grey color, paler than both Russian Blue and Slate Blue. Eyes will be dark.
aaddrr | Blue Beige
Beige with a blue-gray tint. Eyes will be dark.
aaggrr | Platinum
A very light grey color. Eyes will be ruby.
aaggpp | Silver
A very light grey color. Eyes will be pink.
Si Locus
Si | Wild-type
si | Silvering
Turns many of the guard hairs silver or white, giving a silvered appearance.
I Locus
I | Wild-type
i | Smoke
The roots of the hairs turn white, but color remains at the tips, causing an effect much like "smoke" in cats.
H Locus
This gene controls the various whitespotting and markings that can appear on a rat. To see how these different alleles combine, please scroll down to the Special Section on markings.
H | Wild Type
He | Extreme Hooded Pattern
Hre | Restrictive Hooded Pattern
Hro | Essex
h | Hooded
hn | Notched
hi | Irish
hdu | Down Under
When present, this allele causes a colored stripe to appear down the belly.
Hm Locus
This is the hood modifier gene, and controls the length of a rat's stripe. To see how these different alleles combine, please scroll down to the Special Section on markings.
hml | Lengthens spine stripe
hms | Shortens spine stripe
Special Section: Markings
HH | Solid
No white markings.
Hh | Berkshire
Full symmetrical white belly not extending down legs. White feet, and white tail tip to no more than 1/2 its length. Head spot or blaze is possible.
HiHi | American Irish
Symmetrical white spot on belly. Four white feet to ankles and white tip on the tail to no more than 1/4 its length.
Hhi | English Irish
Uniform triangle of white between front legs reaching from armpit to armpit that points down but not extending down belly. Usually seen with two front white feet. Sometimes has white on hind feet/toes and small white tail tip.
Hrehi | Varigated
Colored hood with numerous small patches of color on the shoulders, sides, and tail.
Hrohi | Dalmatian
Lots of little colored spots on a white body.
HeHe | Black Eyed White
An entirely white rat with dark eyes.
hhHmlHml | Hooded
Colored hood that covers the head, neck, chest, and shoulders with white front feet. The body is white with a spine mark that extends from the hood to the tail.
hhHmsHms | Bareback
Similar to hooded, but without the stripe down the back.
hnhn | Capped
Colored head and white body.
HroH | Essex
Color is intense on the back, fading to a lighter shade along the sides, and eventually to white on the belly.
Hroh | Baldie
Entirely white rat with a black band across the eyes that extends up along the ears, leaving a white diamond on the top of the head.
Sl Locus
Sl | No effect
sl | Lethal whitespotting
Pups will be born with white spotting at random points all over their bodies. However, upon weaning, they quickly die from a condition known as "megacolon".
Pe Locus
PePe | Lethal Pearl
Pepe | Pearl
Only expressed on Mink rats.
pepe | Wild-type
Me Locus
Me | Merling
Only expressed on mink rats
me | Wild-type
Cu1 Locus
Cu1 | Curly
Hair is curly. Whiskers are curly too.
cu1 | Wild-type
Cu2 Locus
Cu2 | Curly
Hair is curly, whiskers are curly too.
cu2 | Wild-type
Re Locus
ReRe | Double-rex
No guard hairs, only a wooly undercoat. Whiskers are curly.
Rere | Rex
No guard hairs, only a wooly undercoat. Whiskers are curly.
rere | Wild-type
Fz Locus
Fz | Wild-type
fz | Fuzzy Hairless
Almost entirely hairless, but with a little bit of fuzz here and there.
Shn Locus
Shn | Wild-type
shn | Hairless
Completely hairless.
Rnu Locus
Rnu | Wild-type
rnu | Hairlesss
Completely hairless.
Hr Locus
Hr | Wild-type
hr | Hairless
Completely hairless
K Locus
K | Wild-type
k | Velvet
Hair has a kinked texture to it.
Sat Locus
Sat | Wild-type
sat | Satin
Fur is sleek and extremely glossy, with a high sheen to it and very rich color.
Sh Locus
Sh | Shaggy
Long, wavy hair
sh | Wild-type
Wv Locus
Wv | Wild-type
wv | Wavy
Fur has a wavy texture to it.
Du Locus
Du | Wild-type
du | Dumbo Ears
The ears are slightly larger, and placed more to the side of the head instead of on the top.
Tal Locus
TalTal | Tailless
Completely tailless.
Taltal | Stub tail
Has a stubby tail.
tal | Wild-type
St Locus
St | Wild-type
st | Stumpy or bobbed tail.
Rat has a stumpy or bobbed tail.
Fa Locus
Fa | Wild-type
fa | Zucker's syndrome.
Creates very large, obese, diabetic rats.
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