Lecture 2 - Sperm Count Instrument -SP10protein part of...

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Sperm Count Instrument --SP10—protein part of acrosomal membrane --allows the membranes of sperm and egg to fuse --if SP10 is blocked, sperm and egg will not fuse Egg Activation --In humans, increased protein synthesis in about 5 minutes --Transcription—RNA has already been made --2° oocyte completes meiosis Pronuclei --ploidy?—n+n—fusion of nuclear membrane has not occurred yet --Fusion of haploid pronuclei: During 1 st mitosis --Zygote sperm and egg nuclei do mitosis separately --pronuclei --after cytokinesis, the nuclei finally fuse --blastomeres—completely generic cells—have not differentiated yet First Cell Division: --in humans, about 24 hours after gamete membranes fuse (plasmogamy). --2 celled stage --occurs in distal portion of oviduct Cleavage --rapid cell division—metabolically active --no cell growth --Benefits:
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--smaller pieces --better SA/V ratio --Different cleavage patterns: --determined by amount of yolk Holoblastic Cleavage (sea stars, frogs) --entire volume of zygote continually divided
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Lecture 2 - Sperm Count Instrument -SP10protein part of...

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