How Cloning Works

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Getting a New Nucleus
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Graphic Overview of the Process of Nuclear Transfer   At this point, researchers took one of these cells and removed its nucleus , containing the chromosomes . They also took an egg that had been removed from the ovary of a second adult sheep and cut out its nucleus. The nucleus that had been removed from the first sheep's udder cell was inserted in to the nucleus-free egg. With a tiny jolt of electricity, the two parts fused together . The egg began dividing just like a fertilized egg.
What did each sheep provide in making Dolly?   This egg was cultivated until it had grown into a several-celled embryo . Then it was implanted in the uterus of a third sheep, a surrogate , who carried the lamb until she was born and became known to the world as Dolly.
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Last updated: August 18
, 2000.