Why are bacteriophages independent of the control of chromosomal dna?

Dear student, 

Please find below the solution to the asked query:
Bacteriophages are the viruses which infect bacteria, commonly used as cloning vector in genetic engineering. Bacteriophages produce high copy number of genome within the bacterial cell as they have ability to replicate within the bacterial cells independent of the chromosomal DNA i.e, they do not need their attachment with the host chromosomal DNA to replicate their DNA, so when they enter into the host cell they replicate on their own so that they can increase the desired number of genes. Thus, bacteriophage DNA replicates many times in the host cell and produces many copies of its DNA in the host cell.

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