BIOL 1030H Lecture Notes - Lecture 1: Oogonium, Prophase, Meiosis
14 Mar 2018
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Document Summary
Mitosis causes an increase in undifferentiated stem cells in the ovary that at birth mostly have died off differentiating the remaining cells into primary oocytes. Here they undergo meiosis, stop at prophase 1, until puberty where there is a remaining 300,000. Here they undergo meiosis 2 but stop at metaphase 2 until fertilization. Because there are more sperm then eggs, the sperm have to be able to compete to fertilize the egg. Because at birth ovaries contain about 1-2 million follicles, only 500 fully mature though. The role of the follicle in a cell is to secrete the hormones estrogen, which tell the cell when to release and prepare for fertilization. The cytoplasm in an egg contains the nutrients the support the egg during development before it attaches to the uterine wall, where it receives nutrients from the uterus: https://quizlet. com/2242806/female-gamete-development-flash-cards, mcweeney, c. (2017, november 14).
