silky srivastava
Dear student,Primary oocyte gets arrested at diplotene stage of prophase 1before birth itself i.e. when the female child is inside the mother`s womb. After birth when the female attains puberty, the primary oocyte starts developing and completes its meiosis 1 and develops into secondary oocyte which gets arrested at metaphase II before ovulation . After ovulation, the secondary oocyte ( now called ovum) will complete its meiosis II only if it comes in contact with a sperm otherwise it will get degenerated without completing meiosis II and flow out along with the menstrual fluid.Hpoe it helps!!