BIOL303 Lecture 4: Topic 4 Notes
3 Oct 2017
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Typical sperm structure: haploid nucleus is streamlined and the dna is tightly compacted. In front of the nucleus is the acrosome which is derived from the. Dynein the protein attached to the axoneme microtubules that provides the force for sperm propulsion converting the released chemical energy into mechanical energy. Dynein is in atpase, an enzyme that hydrolyzes atp, to allow the active sliding of the outer doublet microtubules which causes the flagellum to bend. Spermatogenesis: note the elimination of the cytoplasm during this process, centriole center of the centrosome which organizes microtubules and can also go to form the axoneme of the flagellum. Lots of mitochondria in the midpiece to propel the sperm. Egg structure: egg/ovum female gamete capable of binding sperm and being fertilized, oocyte developing egg that cannot yet bind sperm or be fertilized, eggs are enormous cells stockpiled with: Embryogenesis: there are three stages of human oogenesis (embryogenesis), meiotic prophase events of synapsis and recombination.
