| Hierarchy of interactions between Agouti alleles: |
Bay A > At > a
(bay A is dominant over At and 'a'; At is dominant over 'a')
Expected base colors of an E/e or E/E horse:
A/A, A/At, A/a = bay
At/At, At/a = seal brown
A/a = black
Pulled from the DNA test site that NDAppy posted. This is also on almost every other horse color or genetic site I've see so far as well. Where did you read that At was dominant? I'm curious to read this..