COLORS inheritance
Buff:

THE RED GENE (BUFF)
The E gene- This series is called the buff gene. This is the gene that causes Black, 
Black and tan, brown, brown and tan dogs
to be buff.
E - allows the expression of one of the genes in the " B " series ( black or brown ) and is dominant,(non buff(does nothing) to e

e - when homzygous restricts the Black or brown color and produces buff and is recessive to E

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