ABSTRACT
Supernumerary is a term portraying repetition, the presence of something as an extra that is subsequently not required. The B chromosomes in this way have no essential job in the life of a species. The living life form can thus manage without them, yet that does not mean they are useless. B chromosomes in different creatures display drive, so they carry on in explicit manners that challenge typical Mendelian transmission designs to guarantee their legacy in ensuing ages. The B chromosomes are primarily viewed as self-addicted parasites during their evolutionary life. They are converted into regular elements after stability. In the 1940s, some scientists proposed redirecting an insect’s genetic system against itself to destroy insect populations or to make them less destructive. The theory included reducing the reproduction ability of insect populations or causing production of sterile offspring by releasing a large number of mutant 64strains, especially strains with chromosomal translocations, where there is an exchange of whole segments between different chromosomes. B chromosomes happen in a large number of animal groups; in completely known cases they are superfluous, and people with none are constantly present. Further, they never pair with the standard A chromosomes (As) of their hosts. B chromosomes show variety in size. The morphology of B chromosomes varies from that of A(s) and is for the most part heterochromatinized. In plants, these chromosomes are frequently smaller than the smallest A chromosomes. Even though B chromosomes have been studied to a great extent, nonetheless, data about their atomic piece is sparse. B chromosomes are significantly associated with plants and other eukaryotic cells. The disadvantages of B chromosomes are inefficacy in many organisms and the quick emergence of resistance, to mention but a few.
