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* Cell growth, function, and *cell size demonstration * * *the processes by which a cell grows, functions, and divides *Division occurs in order to: *control cell size *repair damaged cells *replace old cells * *Majority of cell cycle: Interphase *3 stages: *G1 (GAP)Cell growth *S phase(Synthesis) DNA is replicated *G2 (GAP2) Cell prepares for division *Cyclins * *A chromosome is a single long strand of DNA. The DNA is packaged by histones (proteins) bound to it. http://micro.magnet.fsu.edu/cells/nucleus/chromatin.html *Centromere: a central constricted region called that serves as an attachment point for the machinery of mitosis. http://ghr.nlm.nih.gov/handbook/basics/chromosome https://sites.google.com/site/mrsebiology97/cell-reproduction/2-o *Interphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm *Prophase Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm *Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm * * The chromosomes are pulled apart by the spindle, which is made of microtubules. The spindle fibers are attached to each centromere (which is part of the chromosome), and anchored on the other end to a centrosome (which is the organizing center for the spindle). * There are 2 centrosomes, one at each end of the spindle. The chromosomes are lined up between the poles of the spindle. * When the spindle fibers contract, the chromosomes are pulled to the opposing poles. *Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm *Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase *Cell Cycle 16 * * During Prophase I, _________ chromosomes pair up together ( called _____________). * The FOUR chromatids together are called a _________. * * http://www.biologyjunction.com/images/modcrossingover.jpg http://www.phschool.com/science/biology_place/labbench/lab3/images/crossovr.gif * During synapsis, some segments of the chromatids that are touching __________ genes. * A ________is a segment of DNA that codes for a specific protein. * This exchanging of genes is called ________________________. * * During Metaphase I, the _________ line up in the center. * During Anaphase I, one of each homologous chromosomes moves to a different end of the cell. * http://www.bio.georgiasouthern.edu/bio-home/harvey/lect/images/comparison. http://www.biology.iupui.edu/biocourses/n100/images/meiosis2cropped. http://www.biology.iupui.edu/biocourses/n100/images/meiosis2cropped.jpg