Genetic Letters

Agouti

A
a = R
A = D
Restricts black to the points

Extension

E
e = R
E = D
Allows black to be expressed if one E is present

Appaloosa

LP
LP = D
lp/Lp = R
Incomplete Dom

Leopard Complex Spotting

PATN1
Dom

Champagne

CH
Dom

Cream Dilution

CR
CR = D
cr/Cr = R
Incomplete Dom

Pearl Dilution

PRL
Rec

Dominant White

W1-28
Gene: KIT
If homozygous for specific DW genes (W5, etc) will lead to aborted fetus

Dun

D
Dom

Frame Overo

O
O = D
o = R
Incomplete Dom

Gray

G
Dom

Roan

RN
Gene: KIT (deadly if homozygous)
Dom

Sabino 1

SB1
SB1/SB1 = All white
SB1/- = More white, with roaning
Incomplete Dom

Silver Dilution

Z
Black pigment require for it to work
Incomplete Dom

Tobiano

TO
Gene: KIT
Dom

Mushroom

MU
MU = D
Mu/mu = R
Recessive (Color is specific to shetlands)

Brindle

BR1
Incomplete Dom + Sex-linked
Females w/ 1 copy are brindle
Males w/ 1 copy or Females w/ 2 copies have spare mane and tail but have no striping