Abstract
Despite the nature of the name "B chromosomes" descend from the idea of extra and dispensable elements of the genome, different from the so called "A chromosomes" and from aneuploidy cases (Beukeboom, 1994), its presence throughout most broad eukaryote clades and its heterogeneity in evolution and behavior amongst species prevent a unified conceptual definition (Camacho, 2005). As a matte…