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CELL DIVISION © 2006 Mesoblast Limited www.mesoblast.comwww.mesoblast.com © 2007 Paul Billiet ODWSODWS.

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Presentation on theme: "CELL DIVISION © 2006 Mesoblast Limited www.mesoblast.comwww.mesoblast.com © 2007 Paul Billiet ODWSODWS."— Presentation transcript:

1 CELL DIVISION © 2006 Mesoblast Limited © 2007 Paul Billiet ODWSODWS

2 Cell division is a fundamental process  All cells come from pre-existing cells  It is necessary to replace worn out cells in multicellular organisms  It is required for growth in multicellular organisms An increase in size will require an increase in surface area to volume ration Cell division subdivides the cytoplasm into small units (cells) surrounded by plasma membranes  It is necessary for reproduction in unicellular or multicellular organisms © 2007 Paul Billiet ODWSODWS

3 Cell division and reproduction  It is necessary for reproduction in unicellular or multicellular organisms Microbus © Microscope-Microscope.orgMicroscope-Microscope.org © 2007 Paul Billiet ODWSODWS

4 Prokaryotes  Prokaryotes have no nucleus  They have a single circular chromosome  Prokaryotes simply divide their cells in two by binary fission © 2007 Paul Billiet ODWSODWS

5 Eukaryotes  Eukaryotes must divide their nucleus (and other organelles such as mitochondria) in preparation for cell division (mitosis or meiosis)  Before the nucleus divides the genetic material replicates (duplicates) © 2007 Paul Billiet ODWSODWS

6 Mitosis  Mitotic division results in genetically identical eukaryotic cells (a clone)  Mitosis is the basis of asexual reproduction © Tyler Junior College, (no commercial use allowed - contact for permission to use) © 2007 Paul Billiet ODWSODWS

7 Meiosis  Meiosis results in a halving of the chromosome number in preparation for fertilisation  Meiosis shuffles genes in new combinations  Meiosis results in genetically different cells  Meiosis and fertilisation are the basis of sexual reproduction © 2007 Paul Billiet ODWSODWS

8 COMPARING MITOSIS AND MEIOSIS © 2007 Paul Billiet ODWSODWS

9 COMPARING MITOSIS AND MEIOSIS © 2007 Paul Billiet ODWSODWS


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