Saturday, February 25, 2012

Plant Cell Cytokinesis?

For a School project, which of the following are visible during cytokinesis?



Chromosomes, sister chromatid, centromere, chromatin, cytoplasm, pole of cell, centrioles, spindle fibers, nucleus, nucleolus, equator of cell, cell plate, cell wall, and cell membrane.



Also, what can i do with a shoe box to make a 3-D model of this?Plant Cell Cytokinesis?
Plant Cytokinesis:



Plant cytokinesis differs significantly from that of animal cells in that instead of forming a contractile ring, plant cells divide by the formation of cross walls between the two daughter cells. New cell wall material is brought to the centre in vesicles by the microtubule system forming the phragmoplast a complex organelle consisting of both microtubules and actin filaments.



~OR~







Cytokinesis (Cytoplasmic Division).



The basic point of cytokinesis is to divide the cytoplasm of the original cell such that each of the nuclei. from mitosis gets roughly equal amounts of cytoplasm and the organelles each new cell is going to need. For instance, you may know that some of the organelles, (e.g. plastids and the



Cytokinesis is different for plant and animal cells. In plant cells a so called cell plate forms roughly equidistant between the ends of the old cell. This cell plate consists of new cell membranes for each new cell. Between these membranes the cell walls for each cell are laid down. Also the new daughter cells then typically get longer. When actively growing plants parts such root tips or new twigs are examined under the microscope one can often see a zone of active cell division right near the tip of the root or twig and then a zone of elongation further back.



In animal cells, cytokinesis involves the formation of a contractile ring made up of cytoskeleton elements. This ring is located right underneath the cell membrane of the original cell and is attached to it. When this ring contracts, a groove called the cleavage furrow forms. This groove eventually deepens and the cell is split into two daughter cells.



Remember that each daughter cell produced by mitosis contains an identical set of unduplicated chromosomes and that now the cell cycle can begin again. It is important also to remember that certain cells may not divide often under normal conditions. For example, the nerve cells in your body typically do not divide after birth. This is one reason why nervous system injuries are so difficult to deal with.





~FOR YOUR PROJECT~



Take a giant poster board and paint the picture from the link below on it.



http://www.sparknotes.com/biology/cellreproduction/mitosis/section3.rhtml
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