Oogenesis, Fish Amphibians

Oogenesis is a key developmental process by which germ cells give rise to a mature ova able to develop into embryos when fertilized. This process starts when diploid oogonia begin meiosis and differentiate into primary oocytes. The oocytes then associate with surrounding somatic cells to form the primary growth follicles, in which the oocytes remain and grow. The morphological changes and molecular mechanisms involved in the early oogeneis of amphibians and teleosts is summarized in this section.