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Section 10-2 Cell Division Biology I Flora. Two Parts of Cell Division (1) Mitosis – division of the cell nucleus (2) Cytokinesis – Division of the cytoplasm.

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Presentation on theme: "Section 10-2 Cell Division Biology I Flora. Two Parts of Cell Division (1) Mitosis – division of the cell nucleus (2) Cytokinesis – Division of the cytoplasm."— Presentation transcript:

1 Section 10-2 Cell Division Biology I Flora

2 Two Parts of Cell Division (1) Mitosis – division of the cell nucleus (2) Cytokinesis – Division of the cytoplasm

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4 Events of the Cell Cycle Interphase – period of the cell cycle between cell divisions Includes G 1, S, and G 2 phases G 1 Phase – Phase where cells do most of their growing – Cells synthesize new proteins and organelles

5 Cont. Events of the Cell Cycle S Phase – Chromosomes are replicated and synthesis of DNA takes place – Proteins are also made G 2 – – Shortest phase of interphase – Organelles and molecules required for cell division are produced – When G 2 is finished, cell enters M phase

6 Mitosis (4 Phases) Prophase – Longest phase of mitosis – Chromosomes become visible and coil tightly – Spindle fibers form – Nuclear envelope breaks down – Nucleolus disappears – Centrioles migrate to opposite sides of nucleus

7 Metaphase 2 nd Phase of mitosis Lasts only a few minutes Chromosomes line up in the middle of the cell Microtubules (spindle fibers) connect centromere of each chromosome to spindle

8 Anaphase 3 rd phase of mitosis Centromeres split – allowing sister chromatids to separate and become individual chromosomes Chromosomes separate and approach the poles of the spindle (opposite ends of the cell)

9 Telophase Final stage of mitosis Chromosomes disperse into a tangle of dense material Nuclear envelope reforms around chromosomes Spindle fibers break apart and nucleolus becomes visible

10 Cytokinesis Cytokinesis – division of the cytoplasm – Completes M phase – The cytoplasm is pinched into equal parts – Each new part contains its own nucleus and organelles

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