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Sexual reproduction in bacteria transduction


Bacteria have no sexual reproduction in the sense that eukaryotes do.

Covers binary fission and how...

The have no alternation of diploid and haploid generations, no gametes, and no meiosis. However, the essence of sex is genetic recombination, and bacteria do have three mechanisms to accomplish that: Many bacteria can acquire new genes by taking up DNA molecules e.

The ability to deliberately transform the bacterium E. The first demonstration of bacterial transformation was done with Streptococcus pneumoniae and led to the discovery that DNA is the substance of the genes. The path leading to this epoch-making discovery began in with the work of an English bacteriologist, Fred Griffith. Courtesy of Robert Austrian, J. The cells of S.

When grown on the surface of a solid culture medium, the capsule causes the colonies Sexual reproduction in bacteria transduction have a glistening, smooth appearance.

These cells are called "S" cells. However, after prolonged cultivation on Sexual reproduction in bacteria transduction medium, some cells lose the ability to form the capsule, and the surface of their colonies is wrinkled and rough "R". With the loss of their capsule, the bacteria also lose their virulence.

Injection of a single S pneumococcus into a mouse will kill the mouse in 24 hours or so. But an injection of over million x 10 6 R cells is entirely harmless. Encapsulated left and nonencapsulated right pneumococci Courtesy of Robert Austrian, J.

The capsule prevents the pneumococci from being engulfed and destroyed by scavenging cells, neutrophils and macrophages, in the body.

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