Question

Release of second polar body from human egg nucleus occurs

• A. After the entry of sperm and before fertilization
• B. After fertilization
• C. Before sperm entry
• D. With no relation to sperm entry

Answer 1

The correct option is A After the entry of sperm and before fertilization

During fertilization, the acrosome's secretion helps the sperm to enter into the cytoplasm of the ovum. This induces the completion of the second meiotic division of the secondary oocyte. The second meiotic division results in the formation of a second polar body and a haploid ovum. Then the haploid nucleus of the sperms and that of the ovum fuse together to form a diploid zygote. Thus, the correct answer is option A.