Ch12 Mitosis

Ch12 Mitosis - The Cell Cycle Chapter 12 Click to edit...

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Click to edit Master subtitle style 11/10/10 The Cell Cycle Chapter 12 PowerPoint Lectures for Biology  8th  edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by 
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11/10/10 Overview: The Key Roles of Cell Division The ability of organisms to reproduce best  distinguishes living things from nonliving matter The continuity of life is based on the reproduction  of cells, or  cell division
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11/10/10 Purpose of Cell Division In unicellular organisms, division of one cell  reproduces the entire organism Multicellular organisms depend on cell division  for: Development from a fertilized cell Growth Repair Cell division is an integral part of the  cell cycle the life of a cell from formation to its own division
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11/10/10 Purpose of Cell Division
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11/10/10 Types of Cell Division Two types of cell division 1. MITOSIS  Most common cell division, results in daughter cells with  identical genetic information, DNA Each body (somatic) cell in an individual organism  contains the same DNA as every other cell in the  organism 2. MEIOSIS A special type of division produces nonidentical daughter  cells (gametes, or sperm and egg cells) 
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11/10/10 Cell Cycle Cells have two main “life phases”,  cell cycle phases Interphase Cell spends most of its life in this phase Three substages : G1, S, G2 Purpose: Cell growth and copying of chromosomes in  preparation for cell division Mitosis (Cell division) Brief phase that occurs only for cells to divide Five substages : prophase, prometaphase, metaphase,  anaphase, telophase
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11/10/10 Cell Cycle Interphase (about 90% of the cell cycle) can be  divided into subphases: G1 phase  (“first gap”) S phase  (“synthesis”) G2 phase  (“second gap”) The cell grows during all three phases, but  chromosomes are duplicated only during the S  phase 
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11/10/10 Cell Cycle
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11/10/10 Concept 12.1: Cell division results in 
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Ch12 Mitosis - The Cell Cycle Chapter 12 Click to edit...

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