cloning These twins each descended from the symmetrical splitting of a single fertilized egg into cells that contain the identical sequence of billions of unconstipated tinier DNA molecules. They occur well-nigh once every 250 births, which makes them about a third as common in the States as fraternal twins, who descend from twain separately fertilized bollock and are no more similar genetically than other(a) siblings. Identical twins are far more well-known(prenominal) than, say, septuplets, but there is still something a little eery about them, from the double-your-pleasure Doublemint girls to the ghost girls haunting the snowbound lodge in "The Shining.
" Maybe its the disorientation induced by a gentlemans gentleman optical illusion. Maybe its the fungibility of existence suggested by two lives apparently as interchangeable as bootleg videotapes. If a twins fate is demonstrably linked to her doubles by invisible clumps of nucleic acid, does that correspond the rest of us are just as dominate by our DNA? How important ...
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