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Download Your body is composed of more than a billion cells
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Cell Cycle and Mitosis Your body is composed of more than a billion cells. An identical copy of your hereditary material is found in the _________ of every somatic (what does somatic mean?___________________) cell in your body. There are 46 chromosomes in each somatic cell. Every time a cell divides, each chromosome (or DNA molecule) must be carefully replicated and distributed to ensure that each daughter cell gets a complete and accurate set of information. The Cell Cycle The major cell stages are: Interphase, Mitosis & Cytokinesis. IPMAT______________________________________________________ Write a sentence in the space above that will help you remember the order. Interphase is subdivided into: G1 (growth 1), S (synthesis), G2 (growth 2) Mitosis is divided into: P (prophase), M (metaphase), A (anaphase), and T (telophase). Cytokinesis follows. INTERPHASE: - the cell is preparing for mitosis Growth 1 Synthesis Growth 2 G1: rapid cell growth S: Synthesis of DNA, producing a replica of every chromosome G2: growth and preparation for cell division Draw a sketch of a typical cell in interphase (p.88) MITOSIS: Mitosis is nuclear division (and cytokinesis) that produces two identical daughter cells during. Draw a Draw aend label sketches of each of the stages space below using pages 88-89 of Nelson Biology 11. Prophase - replicated chromosomes condense and become more visible -nuclear envelope dissolves - centrioles migrate to opposite poles and form spindle fibres Metaphase - spindle fibers align the chromosomes along the middle of the cell nucleus. Anaphase - centromeres divide and the paired chromosomes separate and move to opposite sides of the cell. Telophase - chromosomes arrive at opposite poles of cell - new membranes form around the daughter nuclei. - the chromosomes lengthen and disperse, and are no longer visible under the light microscope. - the spindle fibers disperse dissolve CYTOKINESIS: - division of the cytoplasm animal cell: furrow develops and pinches membrane in two plant cell: cell plate forms and develops new wall
