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There are two primary sites that control color.

The agouti site and the extention site.

Extention controls whether black color can be expressed.

ee is chestnut (no black expression)

Ee and EE allow expression of black color

if the horse is Ee or EE at the extention site the amount of

black is controlled at the Agouti site.

AA or Aa restricts black color to the mane, tail, legs, rims of ears and nostrils

aa no restriction...horse is black

an ++ at the agouti site is wild type bay where the black on the legs ends well below the knees

At is believed to restrict black from muzzle and flanks

Additional variations in base color with counter shading, smuttiness, mealy controlled at other sites.

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