| Tobiano |
TT |
Homozygous. Horse carries two copies of the Tobiano gene. This horse will always produce Tobiano offspring. |
nT |
Heterozygous. Horse carries one copy of the Tobiano gene. |
nn |
Negative for Tobiano. |
| Red/Black Factor |
ee |
Homozygous Red. Horse carries two copies of the Red gene. Horse has a red base pigment. |
Ee |
Heterozygous. Horse is Black based but carries a recessive copy of the Red gene. |
EE |
Homozygous for Black Factor. Horse carries two copies of the Black gene. Horse is Black based. |
| Agouti |
aa |
Non-Agouti. If horse is black based (E), black pigment will be evenly distributed. |
Aa |
Heterozygous. Horse carries one copy of the Agouti gene. |
AA |
Homozygous for Agouti. Horse carries two copies of the Agouti gene. |