A moron, in the context of

bacteriophage A bacteriophage (), also known informally as a phage (), is a virus that infects and replicates within bacteria. The term is derived . Bacteriophages are composed of proteins that Capsid, encapsulate a DNA or RNA genome, and may have structu ...

genetics Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinians, Augustinian ...

, is an extra gene in a

prophage A prophage is a bacteriophage (often shortened to "phage") genome that is integrated into the circular bacterial chromosome or exists as an extrachromosomal plasmid within the bacterial cell (biology), cell. Integration of prophages into the bacte ...

genome without a function in the phage's

lysogenic cycle Lysogeny, or the lysogenic cycle, is one of two cycles of Virus, viral reproduction (the lytic cycle being the other). Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host Bacteria, bacterium's genome or form ...

. These genes may code for products beneficial to the phage's bacterial host, as with the example of gp15 of phage HK97 serving as a superinfection exclusion protein. The term moron comes from the notion that the additional genes mean that these bacteriophage genomes have "more on" them.

References

DNA Bacteriophages {{virus-stub