OOGENESIS for Bio Tech for Grade 9 .pptx

Oogenesis is one process under gametogenesis

1. KRISTEL FATE B. GALLIBU BAMBIE ALLYSA B. BOSI FRANCINE NIKOL B. MALTU MERRY JAINE G. BINGAYAN GERON REI B. DELA CRUZ GODWIN TERRENCE Z. GALANIDO OOGENESIS

2. It is a special process that happens in girls to create egg cells. These cells, also called ova, are very important because they can combine with a sperm cell to start a new life. OOGENESIS:

3. Oogenesis is the type of gametogenesis through which ova , also called the female gametes are formed and the produced female gamete is known as an ovum. GAMETOGENESIS The process of producing gametes, or sex cell. It involves meiosis, a type of cell division that halves the number of chromosomes.

4. Oogenosis is the type of gametogenesis through which ova , also called the female gametes are formed and the produced female gamete is known as an ovum. OVUM It is a single cell released from either of the female ovaries, which is capable of developing into a new organism when fertelized or united with a sperm cell.

5. Oogenesis begins prenatally when primordial germs cells divide mitotically to produced a large number of Oogonia. Oogonia then undergo several more rounds of mitosis to form primary oocytes. Primary oocytes then enter meiosis, but are arrested at prophase 1. Upon pubert, meiosis resumes and the primary oocyte divides to create a secondary oocyte and the first polar body. The secondary oocyte is ovulated into the Fallopian tube close to the time of fertilization. Oogenesis is completed upon fertilization.

6. STAGES OF OOGENESIS: Oogenesis is divided into four main stages: multiplication phase, growth phase, maturation phase, and ovolution phase. These stages are characterized by cell division, growth, and differentiation.

7. STAGES OF OOGENESIS: MULTIPLICATION PHASE: Primodial germ cells divide mitotically to form oogonia, which are diploid cells containing two sets of chromosomes.

8. STAGES OF OOGENESIS: GROWTH PHASE: Oogonia enter a growth phase, increasing in size and accumulating nutrients and organelles. They become primary oocytes, which are also diploid.

9. STAGES OF OOGENESIS: MATURATION PHASE: Primary oocytes undergo meiosis, a type of cell division that reduces the number of chromosomes to half. Meiosis 1 produces a secondary oocyte and a polar body, both haploid. Meiosis 2 can occur only after fertilization, producing a mature ovum and another polar body.

10. STAGES OF OOGENESIS: OVULATION PHASE: The mature ovum is released is released from the ovary and travels through the fallopian tube, where it can be fertilized by a sperm cell.

11. FACTORS AFFECTING OOGENESIS

12. Many factors can influence oogenesis, including age, genetics, hormone levels and environmental factors. These factors can affect the quality of eggs produced.

13. HORMONAL INFLUENCE Hormones, such as FSH ( Follicle-stimulating hormone), regulate the growth and maturation of oocytes.

14. ENVIRONMENTAL FACTORS Exposure to toxins, smoking, and certain medications can negatively affect oocyte quality.

15. CONCLUSION AND SUMMARY Oogenesis is a critical process that ensures the continuation of the species. It’s a complex and regulated process, ensuring the production of healthy and viable egg cells for potential fertilization.

16. QUIZ TIME!

17. 1. The process of producing gametes, or sex cell. Ova Gametogenesis Oogonia

18. 2. What stage when primodal germ cells divide mitotically to form oogonia which are diploid cells containing two sets of chromosomes. a. Growth phase b. Maturation phase c. Multiplication phase

19. 3.Special process that happens in girls to create egg cells. Gametogenesis Oogonia Oogenesis

20. 4. What stage when Oogonia enter a growth phase, increasing in size and accumulating nutrients and organelles. They become primary oocytes, which are also diploid. a. Growth phase b. Maturation phase c. Multiplication phase

21. 5. What stage when the mature ovum is released is released from the ovary and travels through the fallopian tube, where it can be fertilized by a sperm cell. a. Ovulation phase b. Maturation phase c. Multiplication phase

22. THANK YOU!