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Questions and Answers
True or false: All primary oocytes undergo the first meiotic division before puberty.
True or false: All primary oocytes undergo the first meiotic division before puberty.
False (B)
True or false: Oogonia continue to increase in number after the fifth month of prenatal development.
True or false: Oogonia continue to increase in number after the fifth month of prenatal development.
False (B)
True or false: The number of primary oocytes at birth is estimated to be the same for all genetic females.
True or false: The number of primary oocytes at birth is estimated to be the same for all genetic females.
False (B)
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Study Notes
- Oogenesis begins before birth in genetic females.
- Oogonia differentiate into primary oocytes.
- Oogonia increase rapidly in number, reaching 7 million by the fifth month of prenatal development.
- Cell death begins, and many oogonia and primary oocytes become atretic.
- Surviving primary oocytes enter prophase of meiosis I and are surrounded by flat epithelial cells, forming primordial follicles.
- Primary oocytes remain in prophase and do not finish their first meiotic division before puberty due to oocyte maturation inhibitor.
- The total number of primary oocytes at birth is estimated to vary from 700,000 to 2 million.
- Only approximately 400,000 oocytes are present by the beginning of puberty.
- Maturation of oocytes continues at puberty.
- Primary oocytes enter the diplotene stage before proceeding into metaphase.
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