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..
noun, Biochemistry. 1. an essential nutrient, as a trace mineral or vitamin, that is required by an organism in minute amounts. micronutrient. 1. n. A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.