yes mam i am aware but what is the step for seperating the dna from agrose gel

Dear student, 
Please find below the solution to the asked query:

Separation of DNA fragments is done by technique known as agarose gel electrphoresis.
Gel electrophoresis is a powerful technique that helps to purify and separate molecules like DNA contained in a mixture and to estimate their size. The separation of the fragments is an important step of the recombinant DNA technology. The fragments of DNA separated, are analysed for the desired gene which we need to construct the recombinant DNA. Thus gel electrophoresis helps us to separate the desired gene or fragment of DNA from the mixture or unwanted DNA that is used then to construct the recombinant DNA.
Hope this information will clear your doubts about the topic. 
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