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Transcript
GAMETE FORMATION IN ANIMALS Spermatogeneis Process of producing male gametes (sperm) in mammals Steps: 1. A diploid cell called a spermatogonium reproduces by mitosis. 2. At puberty each spermatogonium undergoes meiosis to form 4 haploid cells. 3. Following Meiosis II, each cell develops into a mature sperm. Head nucleus and molecules required by cell Midsection holds many mitochondria (Energy source) Tail flagellum for locomotion Oogenesis process of producing female gametes (eggs) in mammals Steps 1. Before birth, the oogonium (diploid cell) reproduces by mitosis then begin meiosis but stop at prophase I. 2. Meiosis I will continue for one cell each month beginning at puberty. 3. Oogenesis involves the unequal division of the cytoplasm. The cell that receives the most cytoplasm after the first division will continue through meiosis II to form a viable egg. 4. The viable egg contains a large quantity of nutrients to support the zygote after fertilization. 5. Smaller cells, polar bodies, degenerate.
