Genetic recombination in bacteria: horizon of the beginnings of sexuality in living organisms

The current paper reviews the bacterian genetic recombination. Bacteria can transfergenes from one strain to another by three different mechanisms: transformation, conjugation andtransduction, these events showing the universality of sexuality in the living world. Besides geneticrecombination in bacteria, recent evidences of genetic recombination in some superior animals (suchas: fish, birds, mammals and humans) at the sex-chromosomes level support the ‘gene concept ofsexuality’ as a general view of sexuality.