The formation of sperm is called __?__. Spermatogenesis The formation of eggs is called __?__. Oogenesis Sperm and eggs are called __?__. Gametes The formation of sperm or eggs is called __?__. Gametogenesis The process by which spermatids form sperm is called __?__. Spermiogenesis How many chromosomes do primary spermatocytes have? 46 Are those chromosomes in primary spermatocytes duplicated or unduplicated? Duplicated How many chromosomes do spermatids have? 23 Are those chromosomes in spermatids duplicated or unduplicated? Unduplicated Name the cell that divides by meiosis II (spermatogenesis). Secondary spermatocyte Name the cell that divides by meiosis I (spermatogenesis). Primary spermatocyte Name the cell that divides by mitosis (spermatogenesis). Spermatogonium In which organ does sperm formation takes place? Testes Nurse cells are also called __?__ or __?__ cells. Sertoli; sustentacular What is the function of nurse cells? Blood-testes barrier Provide nutrients for developing cells Produce chemicals needed for spermatogenesis Name the tube in which spermatogenesis takes place. Seminiferous tubules Are the least mature sperm closest to or furthest from the lumen of the tube in which spermatogenesis takes place? Furthest For each primary spermatocyte to undergo the process of sperm formation, how many sperm are formed? 4 How long does the process of sperm formation take? 64-72 days About how many sperm does a mature male produce per day? 400 million Do spermatognium A or B mature into primary spermatocytes? B Do spermatognium A or B undergo mitosis? A Are spermatognium A or B further from the lumen of the tube in which spermatogenesis takes place? A How many chromosomes do primary oocytes have? 46 Are the chromosomes in primary oocytes duplicated or unduplicated? Duplicated How many chromosomes do first polar bodies have? 23 Are the chromosomes in first polar bodies duplicated or unduplicated? Duplicated Name the cell that divides by meiosis II (oogenesis). Second oocyte, First polar body Name the cell that divides by meiosis I (oogenesis). Primary oocyte Name the cell that divides by mitosis (oogenesis). Oogonium In which organ does egg formation take place? Ovaries Name the structures in which egg formation take place. These structures are within the organ in which egg formation take place. Follicles How many eggs are formed, at best, for each primary oocyte to undergo the process of egg formation? 1 When does mitosis of oogonia stop? 5th month of gestation When mitosis of oogonia stops, how many oogonia does the female fetus have? 6-7 million When a baby girl is born: name her egg cells. These eggs are arrested in __?__. Primary oocyte; Prophase I About how many egg cells does a female baby have at birth? 2 million About how many egg cells does a girl have at puberty? 400,000 Name the cell that is ovulated. Secondary oocyte In which phase is the egg cell that is ovulated arrested in? Metaphase II Name the cell that is fertilized. Secondary oocyte (divides into ovum) In which phase is the egg cell that is fertilized arrested in? Metaphase II An ovum is formed only if __?__ takes place. sperm penetration During meiosis I and meiosis II, there is an uneven division of __?__. cytoplasm Why is there an uneven division of cytoplasm during meiosis I and meiosis II? Because it ensures that the penetrated egg has nutrients o its 7 day journey to the uterus.