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THE NUCLEOLUS AND ITS GENES IN AMPHIBIAN OOGENESIS

1. Amphibian oocyte nucleoli may be solid and round, or they may take the form of beaded rings. Transformation of the nucleoli from the solid form to the ring form and back again may be a regular feature of oogenesis. The variation in circumference of freshly isolated unstretched ring nucleoli is continuous over a range of about fivefold. The longest rings may measure several hundred micra. All oocyte nucleoli have two structural zones, core and cortex. The core consists of finely fibrous material and is analogous to the ‘pars amorpha’ of earlier authors. The cortex has a granular fine structure and is analogous to the ‘nucleolonema’. The beads of ring nucleoli have both core and cortex components. Some solid nucleoli are multicored.