In order to clone, a cell from an adult mammal is used to grow another, genetically identical clone. The nucleus of the removed cell is removed, and transferred into an egg from which the DNA has been removed. ... An alternative method is to immerse eggs in spermatozoa before bokanovskification makes the resulting embryos into hundreds of identical cloned Gammas, Deltas, and Epsilons. ... Cell structures called telomeres gradually shorten as cells divide and age. ... The premature aging of clones may be linked to the fact that the cells taken from animals have already aged, and when cloned e...

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• Grade Level: High School

What the researchers actually did: they took an unfertilized egg cell from a female sheep and removed the entire DNA (genetic information) from the nucleus that is needed to produce an embryo. ... But this was the first time anybody had made adult mammal genes behave like genes in a fertilized egg. ... The technique would involve taking an unfertilized egg from a human female, removing the nucleus that contains the genetic information, and replacing it with the nucleus from a cell " any cell " of the person to be cloned. This egg, with its new nucleus, is then "tricked" into bel...

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The cloning technique is called somatic cell nuclear transfer, the process used to create "Dolly" the sheep. Her DNA was taken from a single cell from her mother's egg, which is fused with a mammary cell. The fused cell soon develops into an embryo. ... The goal is to create an embryo, which contains special kind of undifferentiated cells called embryonic stem cells. They're so named because specialized cells such as heart, liver or brain cells stem from these undifferentiated cells. ...

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• Grade Level: High School