Separation of first polar body occurs at the time of:
Ans. B OvulationRef: Guyton Physiology, 11th ed. pg. 1027* While still in the ovary, the ovum is in the primary oocyte stage.* Right before it is released from the ovarian follicle, its nucleus divides by meiosis and a first polar body is expelled from the nucleus of the oocyte.* The primary oocyte then becomes the secondary oocyte.* In this process, each of the 23 pairs of chromosomes loses one of its partners, which becomes incorporated in a polar body that is expelled.* This leaves 23 unpaired chromosomes in the secondary oocyte. It is at this time that the ovum, still in the secondary oocyte stage, is ovulated into the abdominal cavity.
Menstruation
Ovulation
Fertilization
Implantation
Endocrinology metabolism