Asexual Reproduction
Asexual reproduction is not a new thing. For bacteria, protozoan, yeast etc also reproduce by asexual reproduction.
' By given a good growing conditions, a bacterium grows slightly in size or length, new cell wall grows through the center, and the " bug " splits into two daughter cells, each with same genetic material. If the environment is optimum, the two daughter cells may split into four in 20minutes.'
( From : http://www.cellsalive.com/ecoli.htm )
The different between sexual and asexual reproduction is that a sexual reproduction is combined with two different genome ( one from male ,one from female ). And then carries out cell division. But for asexual reproduction only one chromosome is used.