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The Cell Cycle Science 9 Lesson #6

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Learning objective To be able to describe, in sequence, the stages and features of the cell cycle, including mitosis and cytokinesis

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Cell division is composed of two processes: mitosis and cytokinesis. Mitosis is the process that divides the nuclear material. Cytokinesis is the process that divides the cytoplasm and the rest of the organelles in half.

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Mitosis and Cytokinesis

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Interphase Cell carries out normal functions Also Growth DNA Replication Preparation for cell division

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Prophase Chromosomes form X-shape with sister chromatids Nucleolus disappears Spindle fibers attach at centromeres stretched across cell by centrioles Nuclear membrane disappears

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Metaphase Spindle fibers pull the chromosomes into a line across the equator

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Anaphase Spindle fibers pull sister chromatids apart and move to opposite poles of the cell

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Telophase Spindle fibers disappear Nuclear membranes form around each set of chromosomes Nucleolus appears in each nucleus

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Cytokinesis Animal Cell: Cell membrane pinches and divides organelles and cytoplasm Plant cell Cell plate forms along the center line Organelles and cytoplasm are divided

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Mitosis assignment 1.Complete the handout on mitosis 2.Choose one A.Make a cell cycle poster (including mitosis in full detail)

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Worksheet Answers: getting to know the cell cycle 1.Three 2.Interphase, DNA 3.Mitosis 4.Cytokinesis, two 5.Four 6.Prophase, nucleolus 7.Metaphase, duplicated chromosomes 8.Anaphase, duplicated chromosomes 9.Telophase, nucleolus

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Worksheet answers: The cell cycle and mitosis 1.E 2.F 3.A 4.D 5.B 6.A 1.A 2.B 3.C 4.A 5.D