<prompt> In a young female of reproductive age with regular menstrual cycles of 28 days ovulation occurs around 14th day of periods. When is the first polar body extruded24 hrs prior to ovulationAccompanied by ovulation48 hrs after the ovulationAt the time of feilization  <response>: A i.e. 24 hours prior to ovulationEvent In OogenesisTime periodMaximum number of germ cell Oogonia few oocyte - 7 million are found by5th month prenatalAll oogonia become atretic and only primary oocyte surrounded by follicular cell ka primordialfollicle remain by7, month prenatalAll primary oocyte have staed prophase of meiosis I, but instead of proceeding into metaphase,they enter diplotene stageNear the time of bihPrimary oocyte remain in prophase of meiosis I untilPubeyPrimordial follicle with primary oocyte grow to form primary preantral- follicle, which grows intosecondary vesicular Graffian- follicle. The 2deg follicle enters preovulatory stage - 36 hours beforeovulation when LH surge occurs resulting in completion of meiosis I and formation ofsecondary oocyte and 1st polar bodyQ- 36 hours before ovulation2deg oocyte enters meiosis 11 but arrests in metaphase- 3 hours before ovulationMeiosis II is completed with formation of ovulin and 2 polar body only ifFeilization occursWithout feilization 2deg oocyte degenerates with in- 24 hours after ovulation 