Meiosis Il in ovum doesn't completes until -

Options

A. Birth
B. Puberty
C. Fertilization
D. Developing follicles

Answer

**Step-by-Step Solution:**

1. **Understanding Meiosis in Oogenesis**:
- Oogenesis is the process of female gamete (ovum) formation. It begins during intrauterine life and involves several stages of meiotic division.

2. **Initial Stages of Oogenesis**:
- The process starts with oogonia, which are diploid cells. These oogonia undergo mitosis to form primary oocytes.

3. **Completion of Meiosis I**:
- The primary oocyte undergoes the first meiotic division, which is completed at puberty. This division is unequal, resulting in a larger secondary oocyte and a smaller first polar body.

4. **Formation of Secondary Oocyte**:
- At the end of Meiosis I, the secondary oocyte and the first polar body are both haploid.

5. **Meiosis II and Fertilization**:
- The second meiotic division (Meiosis II) does not complete until fertilization occurs. The secondary oocyte remains in a suspended state until a sperm cell fertilizes it.

6. **Role of the Male Gamete**:
- During fertilization, the male gamete contributes a centriole, which is essential for completing Meiosis II. This division results in the formation of the second polar body and the ovum.

7. **Conclusion**:
- Therefore, the second meiotic division in the ovum is completed only after fertilization takes place.

**Final Answer**: Meiosis II in the ovum does not complete until fertilization occurs.

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