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A+ is wild bay, and it is a complete dominant gene. One copy of A+ will get you The Look, regardless of whichever agouti gene you apply, resulting in something kind of like this horse. Note the almost non-existent black points.



At is brown, but it is not particularly dominant. One copy of At with no other agouti genes is the darkest shade of brown, like this:



Whereas two copies of brown (AtAt) lighten back up and basically look like bay again:



Note that to actually get 'brown' the horse needs to have some sooty, but with a BBTS you're covered there.

She's lovely!