Abstract
In amphibian oogenesis, essential preconditions are established for a strategy of early development, in which growth and cell division are uncoupled. The fertilized egg cleaves rapidly to form a blastula without a significant expression of the embryonic genes during the first 12 cell cycles and without net intake of food during the first several days. The resources required for fast autonomous embryogenesis are accumulated during the several months of oocyte growth. The axial organization of the embryo is first established in the oocyte, since the direction of the animal-vegetal axis of the egg can be traced back to the nuclear-centriolar axis of the oogonium (Witschi, 1956; Coggins, 1973; Tourte et al., 1981). Also the dorsoventral axis is predetermined in the oocyte of some amphibian species (Wittek, 1952; for a review, see Gerhart, 1980).
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