What Is Which Of The Following Is A Correct Guiding Principle Of Composite Risk Management Crm? - Crowdsourced Questions & Answers at Okela
The menstrual cycle begins with the maturation of oocytes through the process of oogenesis, as well as concurrent follicle development that stimulates ovulation. Oogenesis starts with the process of developing oogonia via the transformation of primordial follicles into primary oocytes, a process called oocytogenesis.
The cells that form human eggs begin meiosis while the mother is herself still an embryo in the womb. But meiosis stops in the middle of prophase I, before birth, and does not resume until after the egg is released from the ovaries from 13 to 55 years later. Nondisjunction of chromosome 21 may be the result of interrupting the complicated process of meiosis for so long time.