The B locus in dogs controls whether the dog is liver. Liver is recessive (b), so a dog needs two copies of the allele in order to be liver. If a dog is bb on the B locus then any and all black in its coat will become a brownish colour. Bb and BB have no effect.
Micro: Mini, small, tiny. Micro is also a term used in the RTS Starcraft, as a term for modified unit control. Micro can also refer to the descriptions of micro-organisms. Micro as a unit of measurement is defined as: One millionth..
The word macro derives from the Greek macros, which means large, while micro stems from the Greek word micros, which means small. Macro and micro, when prefixed to other words, such as microscope and macrocosm, indicate their meaning in relation to scale or function.