ROSLIN DNA CLONE OF SHEEP / 1997

Popular Science - - 75 -

On av­er­age, sheep live 12 years. Though Dolly, the first cloned mam­mal, made it only half that life span, her xe­roxed DNA wasn’t to blame—it was a lung in­fec­tion com­mon in cap­tive an­i­mals. Twenty years later, no one’s mak­ing copies of lost loved ones or pets (as early cloning pro­po­nents spec­u­lated), but bi­ol­o­gists con­tinue to build on Roslin’s work to de­velop em­bry­onic stem-cell ther­a­pies and to clone live­stock.

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