GENERAL HISTOLOGY

Detailed explanation-1: -Explanation: 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.

Detailed explanation-2: -Formation of the second polar body (PB2) occurs after fertilization. Differing from the PB1 that contains bivalent chromosomes, the PB2 contains a haploid set of chromatids.

Detailed explanation-3: -These are: 1. The second polar body (haploid) fuses with the haploid oocyte pronucleus; 2. The second polar body (haploid) fuses with a haploid daughter nucleus from division of the first polar body (diploid); 3. A daughter nucleus from division of the first polar body fuses with the pronucleus; or 4.

Detailed explanation-4: -A polar body is a small haploid cell that is formed at the same time as an egg cell during oogenesis, but generally does not have the ability to be fertilized. It is named from its polar position in the egg.

Detailed explanation-5: -The first polar body may divide to form two second polar bodies. On further division(meiosis II), secondary oocytes again form a mature ovum and one polar body. Therefore, one ovum and three polar bodies are formed after one oogenesis cycle.