Mice are the most commonly utilized animal research model with hundreds of established inbred, outbred, and transgenic strains. In the United States, they are not covered under the Animal Welfare Act (AWA) (administered by the USDA, APHIS) as an animal. However, the Public Health Service Act (PHS) as administered by the National Institutes of Health (NIH) does cover their humane treatment.
Mice are common experimental animals in biology and psychology primarily because they are mammals, and thus share a high degree of homology with humans. The mouse genome has been sequenced, and virtually all mouse genes have human homologs. They can also be manipulated in ways that would be considered unethical to do with humans. Mice are a primary mammalian model organism, as are rats.
There are many additional benefits of mice in laboratory research. Mice are small, inexpensive, easily maintained, and can reproduce quickly. Several generations of mice can be observed in a relatively short period of time. Mice are generally very docile if raised from birth and given sufficient human contact.
I think that it is obvious why they use mice in the laboratory researches the most, but why the white one among the? there are the black ones, the pinkie mice, and others. I think it might have some thing to do with history and adaptation so no body asked about why the white? and it also might have some thing to do with preferring white on black, clean on dirty household black mice. it is just a thought, but who knows these peaple are capable of doing every thing.
I think I have answered some of the question Dr.Mahdi.