GENERAL HISTOLOGY

Detailed explanation-1: -When meiosis I is complete, the resultant oocyte is a secondary oocyte, which gives birth to a mature oocyte and a second polar body at completion of meiosis II. Following ovulation, secondary oocytes are blocked at metaphase II of meiosis II until fertilisation occurs.

Detailed explanation-2: -If the secondary oocyte is not fertilized, it passes into the uterus as an immature egg and soon disintegrates.

Detailed explanation-3: -After ovulation the oocyte is arrested in metaphase of meiosis II until fertilization. At fertilization, the secondary oocyte completes meiosis II to form a mature oocyte (23, 1N) and a second polar body.

Detailed explanation-4: -The secondary oocyte is released after completing meiosis I and before the completion of meiosis II (they are arrested in the metaphase stage).

Detailed explanation-5: -The secondary oocyte remains paused in meiosis II until a sperm cell fertilizes it. This triggers the egg to complete meiosis II. During meiosis II, the duplicated chromosomes are separated into a polar body and a mature ovum. At this point, the haploid nuclei of the egg and sperm are able to fuse to form the zygote.