Coat formed by the combined effect of Paint and Gray on the Black base.
Typical Genetic Formula
E/_ a/a To/n G/n
Possible Genotype Variations
E/e a/a To/n G/n
E/e a/a To/n G/G
E/e a/a To/To G/n
E/e a/a To/To G/G
E/E a/a To/n G/n
E/E a/a To/n G/G
E/E a/a To/To G/n
E/E a/a To/To G/G
The Genetic Basis
For a horse to be born Paint Gray Black, it must receive the following combination from its parents:
- Its ability to express or produce black pigment indicates it received the dominant E allele from at least one parent.
- To be visually black, it needed to inherit the absence of Agouti (a) from both sire and dam.
- Gray does not skip generations. For this animal to be Gray, the sire or dam had to be Gray to provide the (Rn).
- The Tobiano patches that characterize the Paint Horse were inherited from at least one parent.
Understanding the Alleles
The horse Paint Gray Black has a specific combination of alleles. Below, we explain each genetic component that forms this coat:
- a/a (Non-Agouti): Allows black to spread over the entire body when combined with E. In e/e animals it is invisible but still passed on.
- To/ (Tobiano): Vertical white patches crossing the back.
- G/ (Grey): Progressive graying. Epistatic — covers all other colors.
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