In horses black color (B) dominates chestnut color (b). The trotting gait (T) dominates the pacing gait (t). A cross is made between a horse homozygous for black color and the pacing gait, and a horse homozygous for chestnut color and the trotting gait.

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1 Answer

Since Black is dominate, that color is nearly always the color of the offspring. And since Trotter is dominate over a pacer, the offspring will be a Trotter.  The genes will be Bb/Tt.

Parents will be BB/tt  (Black pacer) and bb/TT (Chestnut trotter)  giving you a Bb/Tt.   A Black Trotter. This horse carries both recessive genes.
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