Phages that replicate only via the lytic cycle are known as virulent phages while phages that replicate using both lytic and lysogenic cycles are known as temperate phages. In the lysogenic cycle, the phage DNA first integrates into the bacterial chromosome to produce the prophage.

Temperate phages are the type of bacteriophages that can either undergo a lytic or a lysogenic cycle. These phages are capable of integrating their genetic material into the host cell's chromosome and replicate along with it without causing any apparent harm to the host cell. The lysogenic cycle is also known as the temperate cycle, and it involves the following steps:

1. Adsorption: The temperate phage attaches to the surface of the bacterial cell.

2. Penetration: The phage injects its genetic material (DNA) into the bacterial cell.

3. Integration: The phage DNA integrates into the bacterial chromosome, forming a prophage.

4. Replication: The prophage replicates along with the bacterial chromosome during cell division.

5. Induction: Under certain conditions, such as stress or damage to the bacterial DNA, the prophage can be induced to enter the lytic cycle.

6. Lysis: The phage replicates rapidly, causing the host cell to lyse and release new phages.

Temperate phages are important in genetic recombination and evolution as they allow for the transfer of genetic material between bacterial cells. They can also confer new traits to the host cell, such as antibiotic resistance. Therefore, the understanding of the lysogenic cycle is important in the study of bacterial genetics and evolution.

Phages that replicate only via the lytic cycle are known as virulent phages while phages that replicate using both lytic and lysogenic cycles are known as temperate phages. In the lysogenic cycle, the phage DNA first integrates into the bacterialchromosome to produce the prophage.