AFRMA

American Fancy Rat & Mouse Association

Fancy Mouse Genes, Genetic Code Listing

For more mouse genetics, see the AFRMA Mouse Genetics book, the articles on the Info Pages, and the article Mouse Keeping: Linkage.
See the AFRMA Mouse Color Standards book and the Standards pages for photos.

See also Fancy Mouse Genes, Alphabetical Name Listing sorted by the name of the mouse color or
Fancy Mouse Genes, Agouti-based Colors,
Fancy Mouse Genes, Black-based Colors,
Fancy Mouse Genes, Marked Mice, or
Fancy Mouse Genes, Coats & Misc. for breakdowns by name of mouse color.


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


A: Agouti Series
Ay (dominant or lethal yellow)Fawn: black-eyedAyA or Aya (Ay) (Ay gene changes agouti color to all yellow; called Agouti Yellow or Lethal Yellow)
Fawn: pink-eyedAy– pp
Gold: black-eyedAy
Gold: pink-eyedAy– pp
OrangeB– ee, bb ee, Ay, Aya pp
RedAy– bb
Cream: black-eyedAy– B– cchcch
(chinchillated Fawn)
Cream: ruby-eyedAy– bb cchcch
Cream: pink-eyedAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
SableAyat U–, Aya, Ayat
Sable: BlueAyat dd U–
Sable: ChocolateAyat bb U–
Sable: DoveAyat bb dd U–
Sable: MartenAyat cchcch U–
Silver FawnAyA sisi
White: black-eyedcec, Ay– cece, A– B– cec, cece ee, ss, Ww, ss Ww
Avy (viable yellow)BrindleAvy (Avy gene causes stripes in color; Viable Yellow gene)
A (agouti)AgoutiAA or Aa (i.e. A–)
Agouti: BlueAA dd
Agouti: Blue: pink-eyedAA dd pp
(Argente Creme)
Agouti: ChocolateA– bb (Cinnamon)
CinnamonA– bb (Chocolate Agouti)
Agouti: DoveAA bb dd
(Blue Cinnamon)
Dove AgoutiAA bb dd
(Dove Agouti)
AA bb dd
(Blue Cinnamon)
Silver AgoutiAA cchcch
Silver Agouti: pink-eyedAA cchcch pp
(Argente Creme)
Argente CremeAat cchcch pp (pink-eyed Chinchilla) or AA cchcch pp (pink-eyed Silver Agouti) or AA dd pp (pink-eyed Blue Agouti)
ArgenteA– pp (P.E. Agouti)
Argente: BlueAA dd pp (Pink-eyed Blue Agouti)
Argente: ChampagneAA bb pp
Argente: DoveAA bb dd pp
Silver BrownAA sisi
at (tan)Tansatat
Tan: AgoutiAat
Tan: ArgenteAat pp (P.E. Agouti Tan)
ChinchillaAat cchcch
Chinchilla: BlueAat cchcch dd
(Squirrel)
SquirrelAatcchcch dd
(Blue Chinchilla)
Chinchilla: pink-eyedAat cchcch pp
(Argente Creme)
Argente CremeAat cchcch pp (pink-eyed Chinchilla) or AA cchcch pp (pink-eyed Silver Agouti) or AA dd pp (pink-eyed Blue Agouti)
Tan: Blackatat
Tan: Blueatat dd
Tan: Champagneatat bb pp
Tan: Chocolateatat bb
Tan: CinnamonAat bb
Tan: Doveatat bb dd
Tan: Lilacatat pp
Tan: Pearlatat sisi
Tan: Roanatat roro
Tan: Silveratat pp or atat dd pp
Tan: Silver Blackatat sisi
Tan: Silver Greyatat sisi
Tan: Splashedatat Tg–
SableAyat U–, Aya, Ayat
Sable: BlueAyat dd U–
Sable: ChocolateAyat bb U–
Sable: DoveAyat bb dd U–
Sable: MartenAyat cchcch U–
Siamese Sable: Martenatat cchch
Siamese Sable: Smoke Pearl Martenatat cchch dd
Foxat– cchcch or atat cece
Fox: Blackatat cchcch
Fox: Blueatat cchcch dd
Fox: Chocolateatat bb cchcch
Fox: Doveatat bb cchcch dd
Fox: Ivoryatat B– cec or atat bb cec
Fox: Beigeatat B– cece or atat bb cece
Fox: Coffeeatat B– cece or atat bb cece
Fox: Reverse Siameseatat B– cece or atat bb cece
Spotted TanAat ss, at– ss,
(plus color genes)
Spotted Tan: BandedAat Wshwsh, at– Wshwsh
(plus color genes)
Spotted Tan: Broken MerleAat rounroun ss,
Spotted Tan: HerefordAat wnwn, at– wnwn
(plus color genes)
Spotted Tan: Rump WhiteAat Rwrw, at– Rwrw
Spotted Tan: VariegatedAat Ww, at– Ww
(plus color genes)
a (non-agouti)Blackaa
Black: pink-eyedaa pp
(Lilac)
Lilacaa pp
(P.E. Black)
Blue: pink-eyedaa dd pp
(Silver)
Silveraa pp (P.E. Black) or aa dd pp (P.E. Blue)
Chocolateaa bb
Champagneaa bb pp
(P.E. Chocolate)
Doveaa bb dd
(chocolate blue, dilute Chocolate)
P.E. Doveaa bb dd pp
(Lavender)
Lavenderaa bb dd pp
(P.E. Dove)
Ivoryaa B– cec or aa bb cec
Beigeaa B– cece or aa bb cece
Coffeeaa cece
Reverse Siameseaa B– cece or aa bb cece
Color Point Beigeaa cech
 aa bb cchc dd
(chinchillated Dove)
Cream: pink-eyedAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
Siamese Sableaa cchch
Siamese Sable: Blueaa cchch dd
Himalayanaa chc
Himalayan: Blue Pointaa chc dd
Himalayan: Chocolate Pointaa bb chc
Siamese: Seal Pointaa chch
Siamese: Blue Pointaa chch dd
Siamese: Chocolate Pointaa bb chch
Siamese: Dove Pointaa bb chch dd
Silver Blackaa sisi
Silver Blueaa dd sisi
Silver Chocolateaa bb sisi
Silver Greyaa sisi
Pearlaa sisi
ae (extreme non-agouti)Black: extremeaeae
B: Black/Brown Series
b (brown)Chocolateaa bb
Chocolate Tanatat bb
Chocolate Foxatat bb cchcch
Champagneaa bb pp
(P.E. Chocolate)
Champagne Tanatat bb pp
 aa bb cchc dd
(chinchillated Dove)
Doveaa bb dd
(chocolate blue, dilute Chocolate)
Dove Tanatat bb dd
Dove Foxatat bb cchcch dd
P.E. Doveaa bb dd pp
(Lavender)
Lavenderaa bb dd pp
(P.E. Dove)
OrangeB– ee, bb ee, Ay, Aya pp
Ivoryaa B– cec or aa bb cec
Ivory Foxatat B– cec or atat bb cec
Beigeaa B– cece or aa bb cece
Beige Foxatat B– cece or atat bb cece
Coffee Foxatat B– cece or atat bb cece
Reverse Siameseaa B– cece or aa bb cece
Reverse Siamese Foxatat B– cece or atat bb cece
Chocolate Point Himalayanaa bb chc
Chocolate Point Siameseaa bb chch
Dove Point Siameseaa bb chch dd
Chocolate SableAyat bb U–
Dove SableAyat bb dd U–
Silver Chocolateaa bb sisi
RedAy– bb
Cream: ruby-eyedAy– bb cchcch
Cream: pink-eyedAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
Argente: ChampagneAA bb pp
Argente: DoveAA bb dd pp
Agouti: ChocolateA– bb (Cinnamon)
CinnamonA– bb (Chocolate Agouti)
Cinnamon TanAat bb
Cinnamon: BlueAA bb dd
(Dove Agouti)
Agouti: DoveAA bb dd
(Blue Cinnamon)
Dove AgoutiAA bb dd
(Dove Agouti)
Bt: Belted
bt (belted)Beltedbtbt
C: Color/Chromogen/albino Series
cch (chinchilla)ChinchillaAat cchcch
Chinchilla: BlueAat cchcch dd
(Squirrel)
SquirrelAatcchcch dd
(Blue Chinchilla)
Chinchilla: pink-eyedAat cchcch pp
(Argente Creme)
Silver AgoutiAA cchcch
Silver Agouti: pink-eyedAA cchcch pp
(Argente Creme)
Cream: black-eyedAy– B– cchcch
(chinchillated Fawn)
Cream: ruby-eyedAy– bb cchcch
Cream: pink-eyedAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
 aa bb cchc dd
(chinchillated Dove)
Argente CremeAat cchcch pp (pink-eyed Chinchilla) or AA cchcch pp (pink-eyed Silver Agouti) or AA dd pp (pink-eyed Blue Agouti)
Foxat– cchcch or atat cece
Fox: Blackatat cchcch
Fox: Blueatat cchcch dd
Fox: Chocolateatat bb cchcch
Fox: Doveatat bb cchcch dd
Marten SableAyat cchcch U–
Siamese Sableaa cchch
Siamese Sable: Blueaa cchch dd
Siamese Sable: Martenatat cchch
Siamese Sable: Smoke Pearl Martenatat cchch dd
ce (extreme dilution)Ivoryaa B– cec or aa bb cec
Ivory Foxatat B– cec or atat bb cec
Beigeaa B– cece or aa bb cece
Beige Foxatat B– cece or atat bb cece
Coffeeaa cece
Coffee Foxatat B– cece or atat bb cece
Reverse Siameseaa B– cece or aa bb cece
Reverse Siamese Foxatat B– cece or atat bb cece
Color Point Beigeaa cech
White: black-eyedcec, Ay– cece, A– B– cec, cece ee, ss, Ww, ss Ww
White: pink-eyedcc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) or cece pp or cec pp or chc pp. Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
ch (Himalayan)Himalayanaa chc
Himalayan: Blue Pointaa chc dd
Himalayan: Chocolate Pointaa bb chc
Siamese: Seal Pointaa chch
Siamese: Blue Pointaa chch dd
Siamese: Chocolate Pointaa bb chch
Siamese: Dove Pointaa bb chch dd
Siamese Sableaa cchch
Siamese Sable: Blueaa cchch dd
Siamese Sable: Martenatat cchch
Siamese Sable: Smoke Pearl Martenatat cchch dd
Color Point Beigeaa cech
White: pink-eyedcc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) or cece pp or cec pp or chc pp. Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
c (albino)Albinocc (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-eyedcc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) or cece pp or cec pp or chc pp. Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
Ca: Caracul
Ca (Caracul)CaraculCa–
D: Dilute
d (dilute)Blueaa dd
Blue Tanatat dd
Blue Foxatat cchcch dd
Blue: pink-eyedaa dd pp
(Silver)
Silveraa pp (P.E. Black) or aa dd pp (P.E. Blue)
Silver Tanatat pp or atat dd pp
Doveaa bb dd
(chocolate blue, dilute Chocolate)
Dove Tanatat bb dd
Dove Foxatat bb cchcch dd
Dove: pink-eyedaa bb dd pp
(Lavender)
Lavenderaa bb dd pp
(P.E. Dove)
 aa bb cchc dd
(chinchillated Dove)
Opaldd ee
Silver Blueaa dd sisi
Blue Siamese Sableaa cchch dd
Siamese Sable: Smoke Pearl Martenatat cchch dd
Blue Point Himalayanaa chc dd
Blue Point Siameseaa chch dd
Dove Point Siameseaa bb chch dd
Blue AgoutiAA dd
Blue Agouti: pink-eyedAA dd pp
(Argente Creme)
Agouti: DoveAA bb dd
(Blue Cinnamon)
Blue CinnamonAA bb dd
(Dove Agouti)
Dove AgoutiAA bb dd
(Dove Agouti)
Blue ArgenteAA dd pp
Dove ArgenteAA bb dd pp
Argente CremeAat cchcch pp (pink-eyed Chinchilla) or AA cchcch pp (pink-eyed Silver Agouti) or AA dd pp (pink-eyed Blue Agouti)
Cream: pink-eyedAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
Blue ChinchillaAat cchcch dd
(Squirrel)
SquirrelAatcchcch dd
(Blue Chinchilla)
Dove SableAyat bb dd U–
E: Extension
Eso (sombre or dominant black)Black: dominantEso
e (recessive yellow)OrangeB– ee, bb ee, Ay, Aya pp
Opaldd ee
White: black-eyedcec, Ay– cece, A– B– cec, cece ee, ss, Ww, ss Ww
Fr: Frizzie (code by Bonnie Walters)
fr (frizzie)Frizziefrfr
(Bonnie Walters’ code; there are other recessive and dominant curly genes)
Frizzie Long Hairfrfr ll or frfr gogo
Frizzie Satinfrfr sasa
Frizzie Satin Long Hairfrfr ll sasa or frfr gogo sasa
Fz: Fuzzy/Frizzled
fz (fuzzy/frizzled)Rexfzfz
Frizzled/Fuzzyfzfz
Go: Angora
go (angora)Long Hairll or gogo
Long Hair Satinll sasa or gogo sasa
Frizzie Long Hairfrfr ll or frfr gogo
Frizzie Satin Long Hairfrfr ll sasa or frfr gogo sasa
Hr: Hairless
hr (hairless)Hairlesshrhr
hrrh (rhino)Hairless: rhinohrrhhrrh
Hs: Headspot
hs (headspot)Head Spothshs
Ll: Long Hair (code by Bonnie Walters)
ll (long hair)Long Hairll or gogo
Long Hair Satinll sasa or gogo sasa
Frizzie Long Hairfrfr ll or frfr gogo
Frizzie Satin Long Hairfrfr ll sasa or frfr gogo sasa
Ln: Leaden
ln (leaden)Leadenlnln (looks like Blue)
Mo: Mottled
Mobr (brindle)Brindle: Sex-linkedMobr (causes mottling/stripes in color; a.k.a. X-Brindle or English Brindle)
P: Pink-eyed Dilution
p (pink-eyed)ArgenteA– pp (P.E. Agouti)
Argente TanAat pp
Argente: BlueAA dd pp (Pink-eyed Blue Agouti)
Pink-eyed Blue AgoutiAA dd pp
(Argente Creme)
Argente: ChampagneAA bb pp
Argente: DoveAA bb dd pp
Argente CremeAat cchcch pp (Pink-eyed Chinchilla) or AA cchcch pp (Pink-eyed Silver Agouti) or AA dd pp (Pink-eyed Blue Agouti)
Pink-eyed ChinchillaAat cchcch pp
(Argente Creme)
Pink-eyed Silver AgoutiAA cchcch pp
(Argente Creme)
Pink-eyed FawnAy– pp
Pink-eyed GoldAy– pp
OrangeB– ee, bb ee, Ay, Aya pp
Pink-eyed CreamAya cchcch pp or Aya dd pp or
aa bb cchcch dd pp (chinchillated Dove)
Pink-eyed Blackaa pp
(Lilac)
Lilacaa pp
(P.E. Black)
Lilac Tanatat pp
Pink-eyed Blueaa dd pp
(Silver)
Silveraa pp (P.E. Black) or aa dd pp (P.E. Blue)
Silver Tanatat pp or atat dd pp
Champagneaa bb pp
(P.E. Chocolate)
Champagne Tanatat bb pp
Pink-eyed Doveaa bb dd pp
(Lavender)
Lavenderaa bb dd pp
(P.E. Dove)
Pink-eyed Whitecc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) or cece pp or cec pp or chc pp. Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White
Re: Rex
Re (rex)AstrexReRe
Rn: Roan (dominant)
Rn (roan)Roan: dominantRn–
Ro: Roan (recessive; code by Virginia Pochmann)
Ro (roan, recessive)Roan: recessiveroro
Roan: Tanatat roro
Roun (roan, unstable)Merlerounroun (causes solid patches on a roaned background)
Broken Merlerounroun ss
Broken Merle: Spotted TanAat rounroun ss, at– rounroun ss
(plus color genes)
Rw: Rumpwhite
Rw (rumpwhite)RumpwhiteRwrw
Rump White Spotted TanAat Rwrw, at– Rwrw
S: Piebald Spotted
s (piebald)Broken Markedss
Dutchss
Even Markedss
Herefordwnwn or ss
VariegatedWw or Ss Ww
Spotted TanAat ss, at– ss,
(plus color genes)
Broken Merlerounroun ss
Spotted Tan; Broken MerleAat rounroun ss, at– rounroun ss
(plus color genes)
White: black-eyedcec, Ay– cece, A– B– cec, cece ee, ss, Ww, ss Ww
Sa: Satin
sa (satin)Satinsasa
Long Hair Satinll sasa or gogo sasa
Frizzie Satinfrfr sasa
Frizzie Satin Long Hairfrfr ll sasa or frfr gogo sasa
Si: Silvering
si (silvering)Silver Blackaa sisi
Silver Black Tanatat sisi
Silver Blueaa dd sisi
Silver BrownAA sisi
Silver Chocolateaa bb sisi
Silver FawnAyA sisi
Silver Greyaa sisi
Silver Grey Tanatat sisi
Pearlaa sisi
Pearl Tanatat sisi
Tg: Transgenic
Tg (transgenic)SplashedTg–
Splashed Tanatat Tg–
U: Umbrous
U (umbrous)SableAyat U–, Aya, Ayat
Sable: BlueAyat dd U–
Sable: ChocolateAyat bb U–
Sable: DoveAyat bb dd U–
Sable: MartenAyat cchcch U–
V: Waltzer
v (waltzer)Waltzersvv
Va: Varitint-waddler
Va (varitint-waddler)Varitint-waddlerVa– (gene causes a tri-colored coat, deafness, and circling defect)
W: Dominant Spotting
W (variegated)VariegatedWw or Ss Ww
Variegated Spotted TanAat Ww, at– Ww
(plus color genes)
White: black-eyedcec, Ay– cece, A– B– cec, cece ee, ss, Ww, ss Ww
Wsh (sash)BandedWshwsh
Banded Spotted TanAat Wshwsh, at– Wshwsh
(plus color genes)
Wn: white nose
wn (white nose)Herefordwnwn or ss
Hereford Spotted TanAat wnwn, at– wnwn
(plus color genes)

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

Note: Lilac U.S. = Dove U.K. (P.E. Black), Dove U.S. = Lilac U.K. (Chocolate Blue or Dilute Chocolate)

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Updated March 24, 2016