HGG Community Forums

At the extension black (E) is dominant to chestnut (e). For example EE = black and Ee/eE = black and ee = chestnut. Agouti affects black based (E-) horses, the most dominant is wild bay (A+), then bay (A), then brown (At), then black (a). For example A+A = wild bay, but Aa = bay and only aa will = black.

Yes bay (A-) is dominant over black (aa) and black (E) is dominant over chestnut (e). Grey trumps all the colour genes; no matter what colour it is under the grey, the horse will be grey. For example, the horse you suggested is bay under the grey.