The purpose was not the act of cloning dolly itself, but rather the implications that came as a consequence of the knowledge that we could employ recombinant DNA technology in living organisms to create a clone.
An example of recombinant DNA technology in organisms being put to commercial and productive use is to breed animals (i.e. cows or other dairy - producing livestock) that due to changes in the genetic coding, are able to produce hormones and/or other useful chemicals for humans (insulin, for example, could be produced naturally in the cow's milk) - this genetic trait might occasionally be passed onto offspring naturally, reducing the need to repeat this process.
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