A type of viral replication cycle in which the viral genome becomes incorporated into the bacterial host chromosome as a prophage and does not kill the host.

• A. Lytic
• B. Lysogeny
• C. Prophage
• D. Lytic-lysogenic

Answer: (B)

In bacteriophages, there are two main replication strategies. In the lysogenic pathway, the phage genome integrates into the bacterial chromosome and exists as a prophage. This makes the infection dormate: the host cell survives and divides, passing the prophage to its progeny without being killed. The integrated genome can later be induced to switch to the lytic cycle, which then produces new viruses and lyses the cell.

That’s why lysogeny is the best answer here. The term prophage describes the integrated state of the viral genome, not the cycle itself, and the lytic pathway describes the active, host-killing route. The combined “lytic-lysogenic” isn’t used as a single cycle in standard phage biology.