AFRMA - Fancy Rat Genes, Genetic Code Listing

Fancy Rat Genes, Genetic Code Listing

For more rat genetics, see the AFRMA Rat Genetics book, specific articles listed with the various standards descriptions, and the articles on the Info Pages: Breeding – Colors/Genetics – Rat Genetics, part 1, Rat Genetics, part 2, Rat Genetics, part 3. See also the Rat Biology article Where do Rat Coat Colors Come From?
See the AFRMA Rat Color Standards book and the Standards pages for photos.

Following are the rat genes sorted by genetic code with colors in each gene section that needs that gene to make that color.

Note: Rat genetics were not studied as much as the mice so a lot of the genetic codes have been given by fanciers or are not known

A Am B Br C Cs Cu1 Cu2 Cw D Dal Dmbo Fr Fy Fz G H Hr K M Me N Oe P Pe R Re Rg Rnu Sa Sh Shn Sl St Wv ?

A: Agouti
A (agouti)	Agouti	AA or Aa (i.e. A–)
	Agouti: pink-eyed	A– pp (Silver Fawn)
	Silver Fawn	A– pp (P.E. Agouti; Argente in mice)
	Amber	A– pp (P.E. Agouti) or A– mm pp (P.E. Cinnamon) (a.k.a. a light Silver Fawn)
	Blue Agouti	A– gg* (Opal)
	Opal	A– gg* (Blue Agouti)
	Agouti: Blue: pink-eyed	A– gg pp* (Apricot Agouti)
	Apricot Agouti	A– gg pp* (P.E. Blue Agouti)
	Chocolate Agouti	A– bb (dark Cinnamon; see also Hawthorn Rat Varieties: Chocolate Agouti)
	Agouti: Chocolate: pink-eyed	A– bb pp (Silver Fawn/P.E. Chocolate Agouti)
	Agouti: Platinum	A– bb gg*
	Cinnamon	A– mm (mink agouti)
	Cinnamon: red	A– bb mm
	Cinnamon: dark	A– bb (Chocolate Agouti)
	Cinnamon: ruby-eyed	A– mm Rr
	Cinnamon: pink-eyed	A– mm pp (light Silver Fawn)
	Cinnamon: silvered	A– mm (come out of Cinnamon Pearl litters that lose their silvering as adults)
	Cinnamon Pearl	A– mm Pepe
	Apricot	A– bb pp Rr? or A– mm pp Rr?
	Fawn	A– rr or AA bb rr (ruby-eyed Agouti; Topaz U.K.)
	Topaz (U.K.)	A– rr or AA bb rr (Fawn, U.S.)
	Russian Blue Agouti	A– dd
	Russian Cinnamon	A– dd mm
	Russian Fawn	A– dd rr
	Russian Platinum Agouti	A– bb dd gg*
	Silver Blue Agouti	A– dd gg* or A– dd gg mm?*
	Lilac Agouti	A– bb mm Rr
	Chinchilla	A– Cscs Fyfy? or A– c^chc^ch? or ? (formerly called Silver Agouti; see Breeding the Chinchilla)
	Argente Creme	A– Cscs Fyfy* pp?* or A– c^chc^ch pp? (chinchillated Silver Fawn)
	Squirrel (U.K.)	A– Cscs Fyfy* gg? or A– gg c^chc^ch? (chinchillated Blue Agouti)
	Turpin (U.K.)	A– Cscs FyFy* H^ro++H?* or Cscs Fyfy* H^ro++H?* or A– c^chc^ch H^roH^ro++? (chinchillated Essex)
	Lynx	A– Cscs Fyfy rr?, A– Cscs Fyfy mm rr?, A– Cc^ch?, A–mm rr?, A– rr?, A– rr c^chc^ch or ? (came out of Chinchilla breedings)
	Cinnamon Pearl Merle	A– mm Me– Pepe*
	Agouti Marten	A– c^mc^m#
	Agouti Burmese	A– c^ec^h+ (similar to extreme dilute gene in mice)
	Russian Blue Agouti Burmese	A– c^ec^h+ dd (Russian Blue Agouti Burmese; similar to extreme dilute gene in mice)
	Agouti Siamese Sable	A– c^sc^# (B.E. version shown as Agouti Burmese)
	Agouti Point Siamese	A– c^hc^h
	B. E. Agouti Point Siamese	A– c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Agouti Point Himalayan	A– c^hc
	B.E. Agouti Point Himalayan	A– cⁱcⁱ⁺ (similar to extreme dilute gene in mice)
	Albino	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color; a.k.a. P.E. White)
	White: pink-eyed	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
	White: black-eyed	h^eh^e or any h (marked selected for no spots; in either agouti-based or black-based color)
a (non-agouti/self)	Black	aa
	Silver Black	aa B– (selected for silvering)
	Beige	aa rr or aa bb rr (ruby-eyed Black; Buff U.K.)
	Buff (U.K.)	aa rr or aa bb rr (Beige U.S.)
	Champagne	aa B– pp (P.E. Black)
	Champagne: pale	aa bb pp (P.E. Chocolate)
	Champagne: dark–eyed	aa B– mm rr
	Chocolate	aa bb or aa bb Rr or aa BB Rr
	Silver Chocolate	aa bb (selected for silvering)
	Cocoa	aa bb mm (Coffee in U.K.), aa bb mm Rr, aa Bb mm Rr, aa Bb mm Rr (Havana in U.K.)
	Coffee U.K.	aa bb mm (See also Hawthorn Rat Varieties: Coffee)
	Havana: U.K.	aa Bb mm Rr
	Lilac U.K.	aa bb gg mm Rr*; see also Hawthorn Rat Varieties: Lilac
	Russian Blue	aa dd
	Russian Dove	aa dd mm, aa bb dd gg, aa dd gg mm, aa bb dd
	Russian Dove: pink-eyed	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Russian Dove Pearl	aa dd mm Pepe, aa dd amam Pepe
	Blue-Beige	aa dd rr
	Russian Platinum	aa bb dd gg, aa dd gg mm, aa bb dd, aa dd mm
	Russian Silver	aa dd gg pp, aa bb dd gg pp, aa bb dd gg mm pp, aa dd pp* (P.E. Russian Blue originally called Blue-Champagne)
	Silver Blue	aa dd gg* or aa dd gg mm?*
	Blue	aa gg* (selected for dark shade)
	Sky Blue	aa gg* (medium shade)
	Powder Blue	aa gg* (selected for light shade)
	Silver	aa gg pp* (P.E. Blue)
	Platinum: black-eyed	aa bb gg*
	Platinum: ruby-eyed	aa gg mm*
	Platinum: pink-eyed	aa bb gg pp*
	Dove	aa gg mm, aa bb gg
	Lilac	aa mm or aa amam (selected for lighter color) See photos from 1978 of original U.S.A. Lilac male Hershey and here, owned by Karen Hauser. He was found in a pet shop in Riverside, CA.
	Silver Lilac	aa mm Pepe or aa amam Pepe (selected for colored hair shafts and lighter color)
	Mink	aa mm (selected for darker color)
	Silver Mink	aa mm Pepe (selected for colored hair shafts and darker color)
	Pearl	aa mm Pepe (selected for most of the hair shaft to be white; is a dominant lethal)
	Mink/Lilac Merle	aa mm Me– pepe* or aa amam Me– pepe*
	Silver Mink/Silver Lilac Merle	aa mm Me– Pepe* or aa amam Me– pepe* (selected for colored hair shafts)
	Pearl Merle	aa mm Me– Pepe* (selected for most of the hair shaft to be white)
	Marten	aa c^mc^m#
	Marten: Himi	aa c^mc^h# (Marten with points)
	Burmese	aa c^ec^h+ (similar to extreme dilute gene in mice)
	Sable Burmese	aa c^ec^e+ (similar to extreme dilute in mice)
	Russian Blue Burmese	aa c^ec^h+ dd (similar to extreme dilute gene in mice)
	Blue Burmese	aa c^ec^h+ gg (similar to extreme dilute gene in mice)
	Siamese Sable: Agouti	A– c^sc^# (B.E. version shown as Agouti Burmese)
	Siamese Sable: light/show version	aa c^sc^#
	Siamese Sable: medium	aa c^sc^h#
	Siamese Sable: dark (shown as Sable)	aa c^sc^s#
	Siamese: Seal Point	aa c^hc^h
	Siamese: Black-eyed Seal Point	aa c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Siamese: Blue Point	aa c^hc^h gg*
	Siamese: B. E. Blue Point	aa c^hcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Siamese: Chocolate Point	aa bb c^hc^h
	Siamese: Russian Blue Point	aa c^hc^h dd
	Siamese: B. E. Russian Blue Point	aa c^hcⁱ⁺ dd* (similar to extreme dilute gene in mice)
	Himalayan: Blue Point	aa c^hc gg*
	Himalayan: B.E. Blue Point	aa cⁱcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Himalayan: Russian Blue Point	aa c^hc dd
	Himalayan: B.E. Russian Blue Point	aa cⁱcⁱ⁺ dd (similar to extreme dilute gene in mice)
	Himalayan: Seal Point	aa c^hc
	Himalayan: Black-eyed Seal Point	aa cⁱcⁱ⁺ (similar to extreme dilute gene in mice)
	Albino	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color; a.k.a. P.E. White)
	White: pink-eyed	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
	White: black-eyed	h^eh^e or any h (marked selected for no spots; in either agouti-based or black-based color)
Am/mo: American mink/mock mink (code by fanciers)
am (American mink)	Lilac	aa mm or aa amam (selected for lighter color) See photos from 1978 of original U.S.A. Lilac male Hershey and here, owned by Karen Hauser. He was found in a pet shop in Riverside, CA.
	Russian Dove Pearl	aa dd mm Pepe, aa dd amam Pepe
	Silver Lilac	aa mm Pepe or aa amam Pepe (selected for colored hair shafts and lighter color)
	Mink/Lilac Merle	aa mm Me– pepe* or aa amam Me– pepe*
	Silver Mink/Silver Lilac Merle	aa mm Me– Pepe* or aa amam Me– pepe* (selected for colored hair shafts)
mo (mock mink)	Aussie Mink	aa momo (see page 7 of the article)
B: Brown
b (brown)	Chocolate	aa bb or aa bb Rr or aa BB Rr
	Silver Chocolate	aa bb (selected for silvering)
	Beige	aa rr or aa bb rr (ruby-eyed Black; Buff U.K.)
	Buff (U.K.)	aa rr or aa bb rr (Beige U.S.)
	Champagne: pale	aa bb pp (P.E. Chocolate)
	Dove	aa gg mm, aa bb gg
	Cocoa	aa bb mm (Coffee in U.K.), aa bb mm Rr, aa Bb mm Rr, aa Bb mm Rr (Havana in U.K.)
	Coffee U.K.	aa bb mm (See also Hawthorn Rat Varieties: Coffee)
	Lilac U.K.	aa bb gg mm Rr*; see also Hawthorn Rat Varieties: Lilac
	Chocolate Point Siamese	aa bb c^hc^h
	Russian Dove	aa dd mm, aa bb dd gg, aa dd gg mm, aa bb dd
	Russian Dove: pink-eyed	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Russian Platinum	aa bb dd gg, aa dd gg mm, aa bb dd, aa dd mm
	Russian Silver	aa dd gg pp, aa bb dd gg pp, aa bb dd gg mm pp, aa dd pp* (P.E. Russian Blue originally called Blue-Champagne)
	Platinum: black-eyed	aa bb gg*
	Platinum: pink-eyed	aa bb gg pp*
	Chocolate Agouti	A– bb (dark Cinnamon)
	Platinum Agouti	A– bb gg*
	Apricot	A– bb pp Rr? or A– mm pp Rr?
	Fawn	A– rr or AA bb rr (ruby-eyed Agouti; Topaz U.K.)
	Topaz (U.K.)	A– rr or AA bb rr (Fawn, U.S.)
	Silver Fawn: P.E. Chocolate Agouti	A– bb pp
	Cinnamon: red	A– bb mm
	Cinnamon: dark	A– bb (Chocolate Agouti)
	Lilac Agouti	A– bb mm Rr
	Russian Platinum Agouti	A– bb dd gg*
Br: Bristle Coat (code by AFRMA)
Br (bristle coat)	Bristle Coat	Br (code given by AFRMA)
C: Color/Chromogen/albino Series
c^m	Marten	aa c^mc^m#
	Marten: Agouti	A– c^mc^m#
	Marten: Himi	aa c^mc^h# (Marten with points)
c^e (extreme dilute, code by Nichole Royer)	Burmese	aa c^ec^h+ (similar to extreme dilute gene in mice)
	Burmese: Sable	aa c^ec^e+ (similar to extreme dilute in mice)
	Burmese: Russian Blue	aa c^ec^h+ dd (similar to extreme dilute gene in mice)
	Burmese: Blue	aa c^ec^h+ gg (similar to extreme dilute gene in mice)
	Burmese: Agouti	A– c^ec^h+ (similar to extreme dilute gene in mice)
	Burmese: Russian Blue Agouti	A– c^ec^h+ dd (similar to extreme dilute gene in mice)
c^s	Siamese Sable: Agouti	A– c^sc^# (B.E. version shown as Agouti Burmese)
	Siamese Sable: light/show version	aa c^sc^#
	Siamese Sable: medium	aa c^sc^h#
	Siamese Sable: dark (shown as Sable)	aa c^sc^s#
c^h (Acromelanism/Himalayan)	Burmese	aa c^ec^h+ (similar to extreme dilute gene in mice)
	Burmese: Russian Blue	aa c^ec^h+ dd (similar to extreme dilute gene in mice)
	Burmese: Blue	aa c^ec^h+ gg (similar to extreme dilute gene in mice)
	Siamese: Seal Point	aa c^hc^h
	Siamese: Black-eyed Seal Point	aa c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Siamese: Chocolate Point	aa bb c^hc^h
	Siamese: Russian Blue Point	aa c^hc^h dd
	Siamese: B. E. Russian Blue Point	aa c^hcⁱ⁺ dd* (similar to extreme dilute gene in mice)
	Siamese: Blue Point	aa c^hc^h gg*
	Siamese: B. E. Blue Point	aa c^hcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Himalayan: Seal Point	aa c^hc
	Himalayan: Russian Blue Point	aa c^hc dd
	Himalayan: Blue Point	aa c^hc gg*
	Burmese: Agouti	A– c^ec^h+ (similar to extreme dilute gene in mice)
	Burmese: Russian Blue Agouti	A– c^ec^h+ dd (similar to extreme dilute gene in mice)
	Siamese: Agouti Point	A– c^hc^h
	Siamese: B. E. Agouti Point	A– c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Himalayan: Agouti Point	A– c^hc
cⁱ (intense dilute; code by Nichole Royer)	Siamese: Black-eyed Seal Point	aa c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Siamese: B. E. Russian Blue Point	aa c^hcⁱ⁺ dd* (similar to extreme dilute gene in mice)
	Siamese: B. E. Blue Point	aa c^hcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Himalayan: Black-eyed Seal Point	aa cⁱcⁱ⁺ (similar to extreme dilute gene in mice)
	Himalayan: B.E. Russian Blue Point	aa cⁱcⁱ⁺ dd (similar to extreme dilute gene in mice)
	Himalayan: B.E. Blue Point	aa cⁱcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Siamese: B. E. Agouti Point	A– c^hcⁱ⁺ (similar to extreme dilute gene in mice)
	Himalayan: B.E. Agouti Point	A– cⁱcⁱ⁺ (similar to extreme dilute gene in mice)
	Ivory/B.E. Cream	cⁱc⁺ (similar to extreme dilute gene in mice)
c (albino)	Albino	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color; a.k.a. P.E. White)
Cs: Chinchilla spotting (code by Ann Storey)
Cs (chinchilla spotting)	Chinchilla	A– Cscs Fyfy? or A– c^chc^ch? or ? (formerly called Silver Agouti)
	Argente Creme	A– Cscs Fyfy* pp?* or A– c^chc^ch pp? (chinchillated Silver Fawn)
	Lynx	A– Cscs Fyfy rr?, A– Cscs Fyfy mm rr?, or ? (came out of Chinchilla breedings)
	Squirrel (U.K.)	A– Cscs Fyfy* gg? or A– gg c^chc^ch? (chinchillated Blue Agouti)
	Turpin (U.K.)	A– Cscs FyFy* H^ro++H?* or Cscs Fyfy* H^ro++H?* or A– c^chc^ch H^roH^ro++? (chinchillated Essex)
Cu1: Curly 1
Cu1 (curly1)	Curly 1	Cu1
Cu2: Curly 2
Cu2 (curly2)	Curly 2	Cu2
Cw: Cowlick
cw (cowlick)	Cowlick	cw
D: Dilute
d (dilute)	Russian Blue	aa dd
	Blue-Beige	aa dd rr
	Silver Blue	aa dd gg* or aa dd gg mm?*
	Russian Dove	aa dd mm, aa bb dd gg, aa dd gg mm, aa bb dd
	Russian Dove: pink-eyed	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Russian Dove Pearl	aa dd mm Pepe, aa dd amam Pepe
	Russian Platinum	aa bb dd gg, aa dd gg mm, aa bb dd, aa dd mm
	Russian Silver	aa dd gg pp, aa bb dd gg pp, aa bb dd gg mm pp, aa dd pp* (P.E. Russian Blue originally called Blue-Champagne)
	Russian Blue Burmese	aa c^ec^h+ dd (similar to extreme dilute gene in mice)
	Russian Blue Point Himalayan	aa c^hc dd
	B.E. Russian Blue Point Himalayan	aa cⁱcⁱ⁺ dd (similar to extreme dilute gene in mice)
	Russian Blue Point Siamese	aa c^hc^h dd
	B. E. Russian Blue Point Siamese	aa c^hcⁱ⁺ dd* (similar to extreme dilute gene in mice)
	Russian Blue Agouti	A– dd
	Russian Cinnamon	A– dd mm
	Russian Fawn	A– dd rr
	Russian Platinum Agouti	A– bb dd gg*
	Silver Blue Agouti	A– dd gg* or A– dd gg mm?*
	Russian Blue Agouti Burmese	A– c^ec^h+ dd (similar to extreme dilute gene in mice)
Dal: Dalmatian (code by Nichole Royer)
Dal (Dalmatian; code by Nichole Royer)	Dalmatian	Daldal*
	Collared	? (usually from Dalmatian breedings) or H^eh? or H^ehⁱ?
Dmbo: Dumbo
dmbo (dumbo)	Dumbo	dmbodmbo (ear gene)
Fr: Frizzy
fr^CR (Charles River hairless)	Hairless: CR (Charles River)	fr^CR
fr^H	Fuzzy	fzfz or fr^H
Fy: Fading yellow
Fy (fading yellow)	Chinchilla	Cscs Fyfy? or A– c^chc^ch? or ? (formerly called Silver Agouti)
	Argente Creme	A– Cscs Fyfy* pp?* or A– c^chc^ch pp? (chinchillated Silver Fawn)
	Lynx	A– Cscs Fyfy rr?, A– Cscs Fyfy mm rr?, or ? (came out of Chinchilla breedings)
	Squirrel (U.K.)	A– Cscs Fyfy* gg? or A– gg c^chc^ch? (chinchillated Blue Agouti)
	Turpin (U.K.)	A– Cscs FyFy* H^ro++H?* or Cscs Fyfy* H^ro++H?* or A– c^chc^ch H^roH^ro++? (chinchillated Essex)
Fz: Fuzzy
fz (fuzzy)	Hairless	hrhr or fzfz
	Fuzzy	fzfz or fr^H
G: Gray (code by Nichole Royer)
g (gray; code by Nichole Royer)	Blue	aa gg* (selected for dark shade)
	Sky Blue	aa gg* (medium shade)
	Powder Blue	aa gg* (selected for light shade)
	Silver	aa gg pp* (P.E. Blue)
	Dove	aa gg mm, aa bb gg
	Lilac U.K.	aa bb gg mm Rr*; see also Hawthorn Rat Varieties: Lilac
	Platinum: black-eyed	aa bb gg*
	Platinum: ruby-eyed	aa gg mm*
	Platinum: pink-eyed	aa bb gg pp*
	Russian Dove	aa dd mm, aa bb dd gg, aa dd gg mm, aa bb dd
	Pink-eyed Russian Dove	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Silver Blue	aa dd gg* or aa dd gg mm?*
	Blue Burmese	aa c^ec^h+ gg (similar to extreme dilute gene in mice)
	Blue Point Siamese	aa c^hc^h gg*
	B. E. Blue Point Siamese	aa c^hcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Blue Point Himalayan	aa c^hc gg*
	B.E. Blue Point Himalayan	aa cⁱcⁱ⁺ gg* (similar to extreme dilute gene in mice)
	Platinum Agouti	A– bb gg*
	Blue Agouti	A– gg* (Opal)
	Opal	A– gg* (Blue Agouti)
	Pink-eyed Blue Agouti	A– gg pp* (Apricot Agouti)
	Apricot Agouti	A– gg pp* (P.E. Blue Agouti)
	Silver Blue Agouti	A– dd gg* or A– dd gg mm?*
	Russian Platinum Agouti	A– bb dd gg*
	Squirrel (U.K.)	A– Cscs Fyfy* gg? or A– gg c^chc^ch? (chinchillated Blue Agouti)
H: Hooded
H^re (restricted)	Capped-Stripe	h^reh; H^reh^re (lethal)?
	Berkshire	Hh or hh^e or hⁱhⁱ or hⁱhⁿ
H^ro (Robert/Essex; code by Sheila Sowter)	Essex	H^ro++ or H^ro++H (color fading gene; has Berkshire markings but breeds as a Self)
	Baldie	H^ro++h?
	Turpin (U.K.)	A– Cscs FyFy* H^ro++H?* or Cscs Fyfy* H^ro++H?* or A– c^chc^ch H^roH^ro++? (chinchillated Essex)
hⁱ (Irish)	English Irish	Hh, or Hhⁱ if no Hooded produced in 2 Irish breedings
	Irish	Hh, or Hhⁱ if no Hooded produced in 2 Irish breedings
	Berkshire	Hh or hh^e or hⁱhⁱ or hⁱhⁿ
	Collared	? (usually from Dalmatian breedings) or H^eh? or H^ehⁱ?
	Bareback	hh or hh^e or hHm^s or hhⁱ?
hⁿ (notch)	Capped	hⁿhⁿ
	Berkshire	Hh or hh^e or hⁱhⁱ or hⁱhⁿ
h^e (extreme)	Masked	h^eh^e
	Berkshire	Hh or hh^e or hⁱhⁱ or hⁱhⁿ
	Collared	? (usually from Dalmatian breedings) or H^eh? or H^ehⁱ?
	Bareback	hh or hh^e or hHm^s or hhⁱ?
	Tri-Merle	h^eh Me?
	White: black-eyed	h^eh^e or any h (marked selected for no spots; in either agouti-based or black-based color)
h (hooded)	Hooded	hh or hm^l (Hm=Hooded Modifier; hm^s or hm^l—short or long)
	English Irish	Hh, or Hhⁱ if no Hooded produced in 2 Irish breedings
	Irish	Hh, or Hhⁱ if no Hooded produced in 2 Irish breedings
	Berkshire	Hh or hh^e or hⁱhⁱ or hⁱhⁿ
	Bareback	hh or hh^e or hHm^s or hhⁱ?
	Tri-Merle	h^eh Me?
	Banded	? (from Hooded stock)
h^du (down under)	Down Under	h^du? (dominant)
	White: black-eyed	h^eh^e or any h (marked selected for no spots; in either agouti-based or black-based color)
	White: pink-eyed	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
Hr: Hairless
hr (hairless)	Hairless	hrhr or fzfz
K: Kinky
k (kinky)	Kinky	kk
M: Mink
m (mink)	Mink	aa mm (selected for darker color)
	Silver Mink	aa mm Pepe (selected for colored hair shafts and darker color)
	Lilac	aa mm or aa amam (selected for lighter color) See photos from 1978 of original U.S.A. Lilac male Hershey and here, owned by Karen Hauser. He was found in a pet shop in Riverside, CA.
	Silver Lilac	aa mm Pepe or aa amam Pepe (selected for colored hair shafts and lighter color)
	Dove	aa gg mm, aa bb gg
	Cocoa	aa bb mm (Coffee in U.K.), aa bb mm Rr, aa Bb mm Rr, aa Bb mm Rr (Havana in U.K.)
	Coffee U.K.	aa bb mm (See also Hawthorn Rat Varieties: Coffee)
	Havana: U.K.	aa Bb mm Rr
	Lilac U.K.	aa bb gg mm Rr*; see also Hawthorn Rat Varieties: Lilac
	Platinum: ruby-eyed	aa gg mm*
	Champagne: dark–eyed	aa B– mm rr
	Russian Dove	aa dd mm, aa bb dd gg, aa dd gg mm, aa bb dd
	Russian Dove: pink-eyed	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Russian Dove Pearl	aa dd mm Pepe, aa dd amam Pepe
	Silver Blue	aa dd gg* or aa dd gg mm?*
	Pearl	aa mm Pepe (selected for most of the hair shaft to be white; is a dominant lethal)
	Mink/Lilac Merle	aa mm Me– pepe* or aa amam Me– pepe*
	Silver Mink/Silver Lilac Merle	aa mm Me– Pepe* or aa amam Me– pepe* (selected for colored hair shafts)
	Pearl Merle	aa mm Me– Pepe* (selected for most of the hair shaft to be white)
	Apricot	A– bb pp Rr? or A– mm pp Rr?
	Silver Fawn: light	A– mm pp (P.E. Cinnamon)
	Cinnamon	A– mm (mink agouti)
	Cinnamon: red	A– bb mm
	Cinnamon: ruby-eyed	A– mm Rr
	Cinnamon: silvered	A– mm
	Cinnamon Pearl	A– mm Pepe
	Lilac Agouti	A– bb mm Rr
	Lynx	A– Cscs Fyfy rr?, A– Cscs Fyfy mm rr?, or ? (came out of Chinchilla breedings)
	Russian Cinnamon	A– dd mm
	Silver Blue Agouti	A– dd gg* or A– dd gg mm?*
	Cinnamon Pearl Merle	A– mm Me– Pepe*
Me: Merle (code by Nichole Royer)
Me (merle)	Merle: Cinnamon Pearl	A– mm Me– Pepe*
	Merle: Mink/Lilac	aa mm Me– pepe* or aa amam Me– pepe*
	Merle: Silver Mink/Silver Lilac	aa mm Me– Pepe* or aa amam Me– pepe* (selected for colored hair shafts)
	Merle: Pearl	aa mm Me– Pepe* (selected for most of the hair shaft to be white)
	Tri-Merle	h^eh Me?
N: Naked
n (naked)	Naked	nn
Oe: Odd-eye
oe (odd-eye)	Odd-Eye	oe or ? (has 2 different colored eyes; usually pink/black but can be ruby/black or pink/ruby)
P: Pink-eyed Dilution
p (pink-eye)	Champagne	aa B– pp (P.E. Black)
	Champagne: pale	aa bb pp (P.E. Chocolate)
	Pink-eyed Platinum	aa bb gg pp*
	Silver	aa gg pp* (P.E. Blue)
	Pink-eyed Russian Dove	aa dd mm pp, aa bb dd gg pp, aa dd gg mm pp, aa bb dd pp
	Pink-eyed Agouti	A– pp (Silver Fawn)
	Silver Fawn	A– pp (P.E. Agouti)
	Amber	A– pp (P.E. Agouti; a.k.a. a light Silver Fawn)
	Silver Fawn: light	A– mm pp (P.E. Cinnamon)
	Silver Fawn: P.E. Chocolate Agouti	A– bb pp
	Apricot	A– bb pp Rr? or A– mm pp Rr?
	Apricot Agouti	A– gg pp* (P.E. Blue Agouti)
	Pink-eyed Blue Agouti	A– gg pp* (Apricot Agouti)
	Argente Creme	A– Cscs Fyfy* pp?* or A– c^chc^ch pp? (chinchillated Silver Fawn)
	Pink-eyed White	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
Pe: Pearl
Pe (pearl)	Pearl	aa mm Pepe (selected for most of the hair shaft to be white; is a dominant lethal)
	Russian Dove Pearl	aa dd mm Pepe, aa dd amam Pepe
	Silver Lilac	aa mm Pepe or aa amam Pepe (selected for colored hair shafts and lighter color)
	Silver Mink	aa mm Pepe (selected for colored hair shafts and darker color)
	Silver Mink/Silver Lilac Merle	aa mm Me– Pepe* or aa amam Me– pepe* (selected for colored hair shafts)
	Pearl Merle	aa mm Me– Pepe* (selected for most of the hair shaft to be white)
	Cinnamon Pearl	A– mm Pepe
	Cinnamon Pearl Merle	A– mm Me– Pepe*
R: Ruby-eye/Red-eye
r (ruby-eye/red-eye)	Fawn	A– rr or AA bb rr (ruby-eyed Agouti; Topaz U.K.)
	Topaz (U.K.)	A– rr or AA bb rr (Fawn, U.S.)
	Apricot	A– bb pp Rr? or A– mm pp Rr?
	Russian Fawn	A– dd rr
	Cinnamon: ruby-eyed	A– mm Rr
	Lilac Agouti	A– bb mm Rr
	Lynx	A– Cscs Fyfy rr?, A– Cscs Fyfy mm rr?, or ? (came out of Chinchilla breedings)
	Beige	aa rr or aa bb rr (ruby-eyed Black; Buff U.K.)
	Buff (U.K.)	aa rr or aa bb rr (Beige U.S.)
	Champagne: dark–eyed	aa B– mm rr
	Chocolate	aa bb or aa bb Rr or aa BB Rr
	Cocoa	aa bb mm (Coffee in U.K.), aa bb mm Rr, aa Bb mm Rr, aa Bb mm Rr (Havana in U.K.)
	Lilac U.K.	aa bb gg mm Rr*; see also Hawthorn Rat Varieties: Lilac
	Havana: U.K.	aa Bb mm Rr
	Blue-Beige	aa dd rr
Re: Rex
Re (rex)	Rex	Rere
Rg: Ragged
rg (ragged)	Ragged	rgrg
Rnu: Rowett nude
rnu (rowett nude)	Nude	rnurnu (Rowett nude)
Sa: Satin
sa (satin)	Satin	sasa
Sh: Shaggy
Sh (shaggy)	Shaggy	Sh
Shn: Shorn
shn (shorn)	Shorn	shnshn
Sl: Spotting Lethal
sl (spotting lethal)	B.E. White	slsl (recessive) these suffer from aganglionic megacolon associated with white coat color, usually BEW but occasionally have small spot on head and hips and die usually within first week to 35 days after birth
St: Stub
st (stub)	Tailless	stst? (recessive)
Wv: Wavy
wv (wavy)	Wavy	wvwv
?: Unknown genetics
?	Banded	? (from Hooded stock)
	Blaze	many possible
	Coffee U.S.	? (coffee with cream/gray-brown color)
	Harley	? (recessive; sparse, fine, wispy coat with no undercoat)
	Roan (Husky)	? (recessive; roan gene lightens color with each moult till rat is nearly white; always in Berkshire or Berkshire Blaze markings)
	Roan: Striped	? (recessive; a.k.a. Banded Husky)
	Snowflake	? (small white spots belly and sides; a.k.a. stippeltjes in the Netherlands which means dots)
	Variegated	? (2 Var. never produce Self or Hooded)
	Velvet	? (recessive; short plush coat similar to Rex rabbits)

C: Albino Locus (Burmese)⁺ (codes by Nichole Royer)
C	Full color (no dilution)
c^e+	Extreme dilute
c^h	Acromelanism (Himalayan/Siamese)
cⁱ⁺	Intense dilute
c	Albino (Pink-Eyed White)

C: Albino Locus (Marten and Siamese Sable)^# (codes by Nicole Housel)
C	Full color (no dilution)
c^m#	Marten
c^s#	Siamese Sable
c^h	Acromelanism (Himalayan/Siamese)
c	Albino (Pink-Eyed White)

Note: Many rat colors/varieties have not been studied by geneticists so codes are given by fancy rat genetics experts or are unknown

Note: Capital letter=dominant genes unless otherwise noted; lower case letter=recessive genes

“–” means that either the dominant or recessive allele could occupy that space without affecting the outcome

* = g or Me or Dal code by Nichole Royer

** = Cscs Fyfy code by Ann Storey, N.F.R.S.

+ = c^e or cⁱ code by Nichole Royer

++ = H^ro code by Sheila Sowter, N.F.R.S.

# = c^m or c^s code by Nicole Housel

? = genetics unknown

Updated September 25, 2024