What triggers the completion of meiosis of secondary oocyte?a)Maturation of Graafian follicleb)Entry of sperm into the egg cellc)Release of estrogend)CoitusCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

The secondary oocyte released from the ovary has finished first round of meiosis. The second round of meiosis occurs in ampulla after the egg encounters the sperm. This leads to formation of large ovum and a tiny second polar body.

Answer

Trigger for the completion of meiosis of secondary oocyte:
The completion of meiosis of the secondary oocyte is triggered by the entry of sperm into the egg cell. This event occurs during fertilization, which is the process of the sperm cell penetrating the egg cell.

Explanation:
- When a sperm cell successfully penetrates the egg cell, it triggers a series of changes within the egg cell.
- The sperm cell carries genetic material that combines with the genetic material of the egg cell, forming a zygote.
- The entry of the sperm cell into the egg cell initiates the completion of meiosis in the secondary oocyte, leading to the formation of a mature ovum.
- This process is essential for the formation of a viable embryo, as it ensures that the correct number of chromosomes is present in the resulting zygote.

Significance:
- The completion of meiosis in the secondary oocyte is crucial for the development of a healthy embryo.
- It ensures that the resulting zygote has the correct number of chromosomes for normal development.
- Without the entry of sperm into the egg cell and the subsequent completion of meiosis, fertilization and embryo development cannot proceed.
Therefore, the entry of sperm into the egg cell serves as the trigger for the completion of meiosis in the secondary oocyte, leading to the formation of a mature ovum and the initiation of embryo development.

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