What is formed when reverse transcription is used on a strand of mrna

A double stranded-DNA is formed.

Explanation:

In the reverse transcription process, an enzyme of the DNA polymerase type, has the function of synthesizing double stranded-DNA using a single strander-RNA as a model. The normal Process of transcription encodes de RNA from the initial DNA sequence.

This type of DNA producction is typical of viruses.  

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