Biol 1201 Section 1 CELL DIVISION WORK SHEET MITOSIS INTERPHASE Gap 1 S Gap 2 MITOTIC PHASE Prophase Prometaphase Metaphase Anaphase Telophase and cytokinesis MAJOR EVENTS Increase in cell components Increase in number of organelles Synthesis of DNA Doubling of the genetic material Centrioles replicate in animal cells Structure for cytokinesis is put in place Nucleoli disappear Chromatin condenses Mitotic spindle forms from microtubules in cytoplasm other Centrosomes move away from each Nuclear envelope fragments Microtubules of spindle invade the nuclear region and interact with the chromosomes via the kinetochore Centrosomes at opposite poles Chromosomes arranged at the midplane of the spindle Kinetochores of sister chromatids are attached to opposite poles Sister chromatids separate and move toward the poles Telophase nuclear envelope reforms Spindle breaks down Nucleoli reform Chromatids become less densely colled Cytokinesis division of cytoplasm The mechanism differs between plant and animal cells because plants have a cell wall MAJOR EVENTS Spindle formation Breakdown of nuclear envelope Nucleoli disappear Chromosomes condense Each chromosome consists of two chromatids from S phase of interphase Homologous chromosome pairs lie next to one another Crossing over of chromatids between pairs chiasma formation occurs Chromosome pairs align on equator of spindle Kinetochores of sister chromatids are attached to fibers going to the same pole Nuclear membrane may or may not reform Cytokinesis may or may not occur Cell division like mitosis but starting with the haploid chromosome complement Sister chromatids seperate MEIOSIS Prophase I Metaphase I Telophase I Meiosis 2 MITOSIS Anaphase I Homologous pairs of chromosomes separate Is the cell HAPLOID 1n or DIPLOID 2n Number of chromatids per chromosome AMOUNT OF DNA PER CELL INTERPHASE G1 S G2 MITOTIC PHASE Prophase Prometaphase Metaphase Anaphase Telophase and 2n 2n 2n 2n 2n 2n 1 2 2 2 2 1 X 2X 2X 2X 2X cytokinesis MEIOSIS INTERPHASE G1 S G2 MEIOSIS Prophase I Metaphase I Anaphase I Telophase I Prophase II Metaphase II Anaphase II Telophase II Is the cell HAPLOID 1n or DIPLOID 2n Number of chromatids per chromosome AMOUNT OF DNA PER CELL 2n 2n 2n 2n 1n 1n 1n 1n 1 2 2 2 2 2 2 1 X 2X 2X 2X X X X 5X
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