The (To) gene acts on the base coat forming large, well-defined white patches across the body and legs. Many cases also inherit blue eyes. This coat is based on Smoky Cream.
Typical Genetic Formula
E/_ a/a Cr/Cr To/n
Possible Genotype Variations
E/e a/a Cr/Cr To/n
E/e a/a Cr/Cr To/To
E/E a/a Cr/Cr To/n
E/E a/a Cr/Cr To/To
The Genetic Basis
For a horse to be born Paint Smoky Cream, 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.
- Its blue eyes and pink skin (Double Cream) reveal that both parents were diluted and each passed their Cream gene on.
- The Tobiano patches that characterize the Paint Horse were inherited from at least one parent.
Understanding the Alleles
The horse Paint Smoky Cream 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.
- Cr/Cr (Double Cream): Intense dilution. Pink skin and light eyes such as blue.
- To/ (Tobiano): Vertical white patches crossing the back.
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