The B gene
So, all sheep are either Black or Brown. Yes Even a “white” sheep is genetically black or brown. White is actually a “pattern” and not a color, and just “turns off” the basic black or brown pigment of the sheep. Black is dominant, and brown is recessive. This means that a sheep can look black but be able to produce brown offspring, if it inherited the brown gene from one of its parents.
This gene controls the Black or Brown color of the sheep.