OVERVIEW OF THE DIFFERENT GENES USED
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The different gene combinations and their effects are detailed below. A capital letter denotes a dominant gene and a lower-case letter denotes a recessive gene.
Follow the 'Explanation' link beside each overview to link to the explanation of that gene.
The genes are:
- Hair Length - Shorthair/Longhair
- Hair Type:-
- Cornish or German Rex (Rex1/RexI)
- Devon Rex (Rex2/RexII)
- Selkirk Rex (Rex3/RexIII)
- LaPerm
- Wirehair
- Satin
- Hairless
- Tail Type:-
- Manx (Tail-less)
- Bobtail (Short tail)
- Leg Length - Munchkin/Normal
- Ear Type:-
- Curled
- Folded
- Hair Colour:-
- Base Colour (Black/Chocolate/Cinnamon)
- Red (Red/Tortie)
- Dilute (Blue/Lilac/Fawn/Cream)
- Agouti (Tabby/Shaded/Chinchilla)
- Base Tabby Pattern (Ticked/Mackerel/Classic)
- Spotted Tabby
- Inhibitor (Silver)
- Wideband (Chinchilla/Silver Shaded/Silver Tabby)
- Rufusing (Rufused/Golden)
- Albino (Sepia/Point/Mink)
- Ghostmarkings
- White Spot (Bicolour/Harlequin/Van)
- Mittens/Gloves
- Dominant White (Solid White)
BODY TRAITS:-
Shorthair/Longhair (Explanation)
Shorthair (L) is dominant
Longhair (l) is recessive
LL - Shorthair
Ll - Shorthair (carrying Longhair)
ll - Longhair
Cornish or German Rex (Rex1/RexI) (Explanation)
Normal/non-Rex1 (R) is dominant
Rex1 (r) is recessive
RR - Normal/non-Rex1
Rr - Normal/non-Rex1 (carrying Rex1)
rr - Rex1Devon Rex (Rex2/RexII) (Explanation)
Normal/non-Rex2 (Re) is dominant
Rex2 (re) is recessive
ReRe - Normal/non-Rex2
Rere - Normal/non-Rex2 (carrying Rex2)
rere - Rex2Selkirk Rex (Rex3/RexIII (Explanation)
Rex3 (Se) is dominant
Normal/non-Rex3 (se) is recessive
SeSe - Rex3
Sese - Rex3 (carrying Normal/non-Rex3)
sese - Normal/non-Rex3LaPerm (Wavy Hair) (Explanation)
LaPerm (Lp) is dominant
Normal/non-LaPerm (lp) is recessive
LpLp - LaPerm
Lplp - LaPerm (carrying Normal/non-LaPerm)
lplp - Normal/non-LaPermWirehair (Course, Wiry Hair) (Explanation)
Wirehair (Wh) is dominant
Normal/non-Wirehair (wh) is recessive
WhWh - Wirehair
Whwh - Wirehair (carrying Normal/non-Wirehair)
whwh - Normal/non-WirehairSatin (Silky Hair with a Sheen) (Explanation)
Normal/non-Satin (Sa) is dominant
Satin (sa) is recessive
SaSa - Normal/non-Satin
Sasa - Normal/non-Satin (carrying satin)
sasa - SatinHairless (Explanation)
Normal/Haired/non-Hairless (H) is dominant
Hairless (h) is recessive
HH - Normal/Haired/non-Hairless
Hh - Normal/Haired/non-Hairless (carrying Hairless)
hh - HairlessMost of these genes can be combined - e.g. you can have a Longhair RexI LaPerm Satin.
Manx (Tail-less) (Explanation)
Tail-less (M) is dominant
Tailed (m) is recessive
MM - this gene combination is lethal and will not produce kittens (see the explanation) Mm - Tail-less (carrying Tailed)
mm - TailedBobtail (Short tail) (Explanation)
Normal/non-Bobtail (Jp) is dominant
Bobtail (jp) is recessive
JpJp - Normal/non-Bobtail
Jpjp - Normal/non-Bobtail (carrying Bobtail)
jpjp - Bobtail
Munchkin (Short Legs) (Explanation)
Munchkin (Mu) is dominant
Normal/non-Munchkin (mu) is recessive
MuMu - Munchkin
Mumu - Munchkin (carrying Normal/non-Munchkin)
mumu - Normal/non-Munchkin
Curled (Explanation)
Curled (Cu) is dominant
Normal/non-Curled (cu) is recessive
CuCu - Curled
Cucu - Curled (carrying Normal/non-Curled)
cucu - Normal/non-CurledFolded (Explanation)
Folded (Fd) is dominant
Normal/non-Folded (fd) is recessive
FdFd - Folded
Fdfd - Folded (carrying Normal/non-Folded)
fdfd - Normal/non-FoldedThese genes can be combined so that you can have Curled Folded ears.
Hair Colour:- (Explanation)
Base Colour (Black/Chocolate/Cinnamon) (Explanation)
Black (B) is dominant to both Chocolate (b) and Cinnamon (b1)
Chocolate (b) is recessive to Black (B) but dominant to Cinnamon (b1)
Cinnamon (b1) is recessive to both Black (B) and Chocolate (b)
BB - Black
Bb - Black (carrying Chocolate)
Bb1 - Black (carrying Cinnamon)
bb - Chocolate
bb1 - Chocolate (carrying Cinnamon)
b1b1 - CinnamonRed (Red/Tortie) (Explanation)
The red 'gene' is 'carried' on the 'x-chromosome' - one of the two chromosomes that decide the sex of a cat. A male is 'xy' and a female is 'xx'. The symbol for a red gene is 'xo'. Red covers all colours except white. xy - Male, non-Red (e.g. Black, Chocolate etc.)
xx - Female, non-Red
xoy - Male, Red
xox - Female, Tortie (1 red 'gene', 1 black 'gene'; therefore patches of each)
xoxo - Female, RedDilute (Blue/Lilac/Fawn/Cream) (Explanation)
Normal/non-Dilute (D) is dominant
Dilute (d) is recessive
DD - Normal/non-Dilute (i.e. Black, Chocolate, Cinnamon or Red)
Dd - Normal/non-Dilute (carrying Dilute)
dd - Dilute (i.e. Blue, Lilac, Fawn or Cream)Agouti (Tabby/Shaded/Chinchilla) (Explanation)
Agouti (A) is dominant
Self/non-Agouti (a) is recessive
AA - Agouti
Aa - Agouti (carrying Self/non-Agouti)
aa - Self/non-Agouti (Solid)Base Tabby Pattern (Ticked/Mackerel/Classic) (Explanation)
Ticked Tabby (Ta) is dominant to both Mackerel (t) and Classic (tb)
Mackerel Tabby (t) is recessive to Ticked (Ta) but dominant to Classic (tb)
Classic Tabby (tb) is recessive to both Ticked (Ta) and Mackerel (t)
TaTa - Ticked Tabby
Tat - Ticked Tabby (carrying Mackerel)
Tatb - Ticked Tabby (carrying Classic)
tt - Mackerel Tabby
ttb - Mackerel Tabby (carrying Classic)
tbtb - Classic TabbyTicked tabby also masks Spotted Tabby (see below), making it the most dominant form of tabby
Spotted Tabby (Explanation)
Spotted (Sp) is technically dominant, but because of the way it works, Ticked Tabby (Ta) will show anyway
Non-Spotted (sp) is recessive, but only makes a visible difference if the cat is Mackerel (t) or Classic (tb)
SpSp - Spotted Tabby (unless the cat is also Ticked Tabby)
Spsp - Spotted Tabby (carrying non-Spotted)
spsp - non-Spotted Tabby (i.e. Mackerel or Classic)Inhibitor (Silver) (Explanation)
Silver (I) is dominant
Normal/non-Silver (i) is recessive
II - Silver
Ii - Silver (carrying Normal/non-Silver)
ii - Normal/non-SilverWideband (Chinchilla/Silver Shaded/Silver Tabby) (Explanation)
Wideband (Wb) is dominant
wideband (wb) is recessive
WbWb - Chinchilla
Wbwb - Silver Shaded
wbwb - Silver TabbyRufusing (Rufused/Golden) (Explanation)
Non-Rufused (Rf) is dominant
Rufused (rf) is recessive
RfRf - non-Rufused
Rfrf - non-Rufused (carrying Rufusing)
rfrf - Rufused (or Golden, if combined with Inhibitor/Silver)Albino (Sepia/Point/Mink) (Explanation)
Full-Colour/non-Albino (C) is dominant to both Albino alleles (cb/cs)
There is no dominant/recessive relationship between the albino alleles
CC - Full-Colour/non-Albino
Ccb - Full-Colour/non-Albino (carrying Burmese/Sepia)
Ccs - Full-Colour/non-Albino (carrying Siamese/Point)
cbcb - Burmese/Sepia
cscs - Siamese/Pointed
cbcs - Tonkinese/MinkGhostmarkings (Explanation)
Non-ghostmarked (Gm) is dominant
Ghostmarked (gm) is recessive
GmGm - no Ghostmarkings
Gmgm - no Ghostmarking (carrying Ghostmarkings)
gmgm - shows GhostmarkingsWhite Spot (Bicolour/Harlequin/Van) (Explanation)
White Spot (S or S1) is dominant to non-White Spot (ss)
Bicolour is dominant to all other forms of White Spot
Harlequin is dominant over Van
SS - Bicolour
Ss - Bicolour
S1s - Bicolour
SS1 - Harlequin
S1S1 - Van
ss - no White SpottingMittens/Gloves (Explanation)
Non-Mitted (G) is dominant
Mitted (g) is recessive
GG - non-Mitted/non-Gloved
Gg - non-Mitted/non-Gloved (carrying Mittens/Gloves)
gg - Mitted/GlovedDominant White (Solid White) (Explanation)
White (W) 'covers' all other colours (epistatic) and is dominant to non-White
Non-White (w) is recessive
WW - White
Ww - White (carrying non-White)
ww - non-White (e.g. Black, Blue Mackerel Tabby, Red Point, etc.)
Go to:
Genetics Help Home
Colours
The basics
Overview of the different genes used (current page)
Explanations of the genes
How to work out the results of a breeding
Some examples of breeding calculations
Further help