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Oogenesis Steps

QuestionAnswer
What is the first step of Oogenesis? Oogonia give rise to oocytes; multiply by mitosis; begin meiosis in fetal development but stop in prophase I and are now called primary oocytes; remain until puberty
What is the second step of Oogenesis? Primary oocytes become surrounded by a single layer of granulosa cells, creating a primordial follicle; present until puberty
What is the third step of Oogenesis? Primordial follicles develop into primary follicles when granulosa cells enlarge and increase in number
What is the fourth step of Oogenesis? Secondary follicles form when fluid-filled vesicles develop and theca cells arise on the outside of the follicle
What is the fifth step of Oogenesis? Mature follicles form when vesicles create a single antrum
What is the sixth step of Oogenesis? Just before ovulation, primary oocyte completes meiosis I, creating a secondary oocyte and a nonviable polar body
What is the seventh step of Oogenesis? Secondary oocyte begins meiosis II, stops at metaphase II
What is the eighth step of Oogenesis? Secondary oocyte is released from the ovary
What is the ninth step of Oogenesis? Secondary oocyte only completes meiosis II if fertilized by a sperm cell; completion of meiosis II forms an oocyte and a second polar body; fertilization is complete when oocyte nucleus and sperm nucleus unite, creating a zygote
What is the tenth step of Oogenesis? Granulosa cells divide rapidly and enlarge to form the corpus luteum
What is the eleventh step of Oogenesis? Corpus luteum degenerates to form a scar called the corpus albicans
Created by: smurtab
 

 



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