Cloning 101
Dolly the clone (and little
Polly the clone, too)
Since 1996, when pioneering Scots cloned Dolly the sheep from an adult sheep cell, scientists have cloned mice, cows, goats, pigs, rabbits, cats, rats, deer, mules, horses, and dogs. Yet despite all the success, cloning remains really, really hard to do.
Nature makes clones--genetic duplicates--all the time. We call them identical twins. But twins grow according to the DNA code from embryonic stem cells--cells that are supposed to divide and grow into complete adult beings. Cloners try to get the DNA from adult cells to do the same thing.
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