Germ cells are the cells of the embryo which give rise to gametes.
Evidence for the equivalence of genetic material in all cells Briggs and King's experiments in Rana pipiens Figure 2.6. Gurdon's experiments in Xenopus laevis . He concluded that the nucleus of a differentiated cell can direct limited development of an enucleated egg. However, there is a restriction in the ability of the older nuclei to function in this capacity. The idea of differential gene expression Every cell nucleus within an organism contains the same complete genome as was in the fertilized egg.