Process of oocyte production starting at puberty, some ooctyes stimulate to continue meiosis, meisosis results in oocytes having half number of chromosomes as other body cells, when primary oocyte undergoes meiosis I, divides unequally, giving rise to large , haploid; Secondary Oocyte and tiny first polar body, fertilization occur, second unewula cytoplasmic division(meiosis II) give rise to large Egg cells and tiny second polar body, polar bodies certain unneccessary genetic material and have no function, so denegenerate, end of meiosis II, chromosomes of sperm and ovum combine, resulting in formation of Zygote