When a blastocyte has formed (an embryo containing about 100 eggs), the very young embryo is implanted into a suitable host animal, where it develops until birth. ![]() At this point, a small electrical shock triggers the zygote to begin dividing. Once inside the egg cell, the somatic nucleus is reprogrammed by largely unknown factors to act as the nucleus of a fertilized egg, or zygote. ![]() Dolly the first cloned mammal (Photo: Toni Barros via Wikipedia CC 2.0)ĭolly was cloned using the SCNT method, in which the nucleus of a somatic cell (any cell but egg or sperm) is removed and subsequently embedded in an egg cell whose nucleus had been previously removed.
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