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Transcript
Pö ÿalima 02-26-10 Cell Division You will need your computer today 10.2 Goals I will be able to explain what happens in the cell cycle. I will be able to explain and identify the stages of mitosis. Mitosis 10.2 Cell cycle = Life span of the cell G1 phase – cell grows, makes more organelles and proteins G1 phase S phase – chromosome replication (S = synthesis = “to make”) S phase G2 phase Chromosomes and Chromatid Each chromosome made of two identical chromatids. Attached together by the centromere Cell cycle = Life span of the cell G1 phase – cell grows, makes more organelles and proteins G1 phase S phase – chromosome replication (S = synthesis = “to make”) G2 phase – molecules and organelles required for cell division produced M phase – mitosis and cytokinesis Interphase – G1, S, G2 S phase G2 phase CELL DIVISION Eukaryotes (cells with a nucleus) go through 2 stages of division Mitosis – division of the nucleus Cytokinesis – division of the cytoplasm MITOSIS 4 phases of nuclear division Prophase Longest phase of mitosis Chromosomes become visible Centriole pairs begin to separate Spindle fiber forms (made of microtubules) Nuclear envelope breaks down Spindle begins to attach to chromosomes at the centromere Metaphase Chromosomes line up across center of the cell (“equator” or “metaphase plate”) Centriole pairs at opposite ends of the cell Centromere connected to the spindle fibers Anaphase Sister chromatid split apart Chromosomes get pulled to opposite poles by the shrinking spindle fibers Telophase Chromosomes decondense Nuclear envelope reforms around each set of chromosomes at opposite ends of the cell 2 nuclei are formed Cytokinesis Division of the cytoplasm 2 new daughter cells are formed with the same number of chromosomes as the original cell. Video of Mitosis http://highered.mcgrawhill.com/sites/0072437316/student_view0/chapter11/anim ations.html# http://www.youtube.com/watch?v=s1ylUTbXyWU&featur e=related Name the stages… Try This Virtual Lab http://bio.rutgers.edu/~gb101/lab2_mitosis/section1_fram es.html Homework Online Mitosis W/S Mitosis Flipbook. Include: Interphase, pro-, meta-, ana-, telo-, cytokinesis Homework Pg. 249 #1-6 Pg. 257 #13-14
