Question

In human females, meiosis II occurs ______.

Options

• at ovulation

• immediately after the sperm penetration of the secondary oocyte

• immediately after the sperm penetrates the primary oocyte

• none of the above

Answer 1

In human females, meiosis II occurs immediately after the sperm penetration of the secondary oocyte.

Explanation:

In human females, meiosis II is arrested at metaphase II and completes only after the sperm penetrates the secondary oocyte, which triggers the completion of meiosis II leading to the formation of the ovum and the second polar body. This process happens immediately after sperm entry into the secondary oocyte, not at ovulation or sperm penetration of the primary oocyte.