Biology form 5 process of oogenesis

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  • 1. PROCESS OF OOGENESIS Prepared by: Zulsahira Yasti Zulsalleh Shalina Solomon Willybroad Benedict
  • 2. WHAT IS OOGENESIS?  Oogenesis is the formation of ovum or egg, starts in the ovaries of the foetus before birth. HOW IT’S OCCURS??  There are 5 stages of oogenesis process 1. The germinal epithelial cells divide repeatedly until many diploid oogonia are formed. 2. The oogonia grow to form primary oocytes that surrounded by a layer of follicle cells.
  • 3. 3. The oocytes undergoes the first meiotic division to become a secondary oocyte and a first polar body.(haploid) 4. The follicle cells surrounding the primary focille develop into the secondary follicle. –The follicle layer of the secondary oocyte thickens and folds to form the Graafian follicle . -When the Graafian follicle become matures,it will move towards the surface of the ovary wall and rupture to release the secondary oocyte(n). 5. The secondary oocytes that has complete meiosis II when it is fertilized by a sperm(n).The final product of meiosis II is the ovum and the seond polar body.
  • 4. THE DIFFERENCES BETWEEN SPERMATOGENESIS AND OOGENESIS ASPECT SPERMATOGENESIS OOGENESIS Site of process In the testes In the ovaries Cells produced Sperm Ova or egg. Size of cells Small Big Cell structure Consist of the head , middle pieces and tail Round Number of gamates produced. Four funcional cells One funcional cells and three non-funcional polar bodies.
  • 5. ASPECT SPERMATOGENESIS OOGENSIS Meiosis Occurs continuously Not continues. Stops at meiosis I. Meiosis II occurs only if sperm penetrates the secondary oocyte. Density of organelles Many mitochondria, less cytoplasm. Fewer mitochondria, more cytoplasm. Parent cells Infinite number of cells can become sperm. Limited number of cells can become ova.
  • 6. SIMILARITIES OF SPERMATOGENESIS AND OOGENESIS. 1. Both occur in the reproductive organs. 2. Both produces haploid(n) gamates that are involved in fertilization. 3. Both involve meiosis.
  • 7. THANK YOU FOR YOUR ATTENTION SAHIRA SHALINA WILLY