After an egg is fertilized, the cells begin dividing rapidly. At this stage, they are undifferentiated and identical. So if you could go to the mass of cells at the very beginning, when there are say 8 cells, could you cut the cell bundle in half, to two sets of 4 cells, and let them keep dividing and doubling into two completely new babies? Could you do this infinitely in a lab? And create thousands of clones from a single fertilized egg?
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That is how identical twins are born. A zygote splits into two on that early stage and you get two embryos with identical DNA.
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