Explain the process of oogenesis is depth: Follicle Development in Ovary Meiotic Events Before birth 2n Oogonium (stem cell) -Follicle cells Mitosis- Oocyte 2n Primary oocyte- Primary follicle Growth- Primary oocyte 2n (arrested in prophase I; present at birth) Primary follicle Childhood (ovary inactive) Monthly from puberty to menopause Primary follicle 2n Primary oocyte (still arrested in prophase I) Growing follicle Mature vesicular Meiosis I (completed by one- primary oocyte each month) (Graafian) follicle Secondary oocyte (arrested in metaphase II) First polar body Ovulation -Sperm Ovulated secondary oocyte Meiosis Il of polar body (may or may not occur) - Meiosis Il completed (only if sperm penetration occurs) Polar bodies Second Ovum (all polar bodies degenerate) polar body

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