The major prokaryotic groups

The Prokaryotes can be divided into two kingdoms that are the Bacteria and the Archaea. Prokaryotes are single-celled organisms. They are the simplest, smallest organisms. They are abundant in the air, water, soil and on most objects. Lateral gene transfer (LGT) is now known to be a major force in the evolution of prokaryotic genomes. To date most analyses have focused on either

(a) Verifying phylogenies of individual genes by to have been transferred

(b) Estimating the fraction of individual genomes likely to have been introduced through transfer.