Backcross .
Crossing an organism with one of its parents genetically equivalent organism. The offspring of such cross are referred to as the backcross generation or backcross progeny. See testcross.
Bacteria
1. Plural of bacterium, q.v.
2. One celled microorganisms which do not have a nuclear membrane.
Bacterial toxin
A toxin produced by a bacterium, such as Bt toxin by Bacillus thuringiensis.


