oogenesis


 * __Oogenesis__** __is the process of how a primary oocyte turns into a mature ovum.__ [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Gray5.svg/260px-Gray5.svg.png align="left"]]

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At the begining a primary oocyte undergoes meiosis I, which separates the cell into a haploid cell. After this it undergoes meiosis II, which the cell is now separated into 4 (a haploid). the female body only undergoes meiosis II in her lifetime becouse it undergoes meiosis I before birth. An ovum need all the nutrients neccesary to form an offspring so out of 4 haploid cells only 1 turns into an ovum. the others turn inot polarbodies becouse of lack of nutrients.======