) Describe the various experiments conducted by scientists to analyse the developmental potency of the embryonic nuclei. Also give the conclusions drawn by the scientists from these experiments.

The experimental results of this nature provide strong support to the hypothesis thal within an organism all cells regardless of the type of their differentiation and functional assignment, are genetically equivalent; that is the nuclei of all of them contain a complete genome identical to that of the zygote nucleus. But are the nuclei of differentiated cells also capable of directing normal development and generating of cells of all types like the nucleus of a zygote? In other words, do the nuclei of cells derived from the zygote retain the totipotency of their nucleus or do they undergo some irreversible functional restrictions in the course of differentiation of cells? The most direct method of seeking an answer to this question involves the use of the technique of nuclear transplantation in suitably designed ___ ________ __________ _____ _______ ________ ________ _________ _______ ________.
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