sea urchin cell division

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sea urchin cell division

• http//www.exploratorium.edu/imaging_station/galle
  ry.php?AssetcelldivCategoryseaurchinsTypevide
  o

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Interphase
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Prophase

• chromatin condenses
• centrioles move towards opposite sides of the
  nucleus
• nuclear membrane disappears
• Nucleolus disappears

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Prophase
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Metaphase

• nucleus disappears
• centrioles at poles
• spindles connect to chromosomes
• Chromosomes equatorial plane

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Metaphase
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Anaphase

• centromeres split
• spindle fibers pull one chromatid toward each
  pole of the cell

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Anaphase
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Telophase

• spindle disappear
• chromatids unwind into chromatin
• nuclear membrane (chromatin)
• Nucleolus reforms

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Telophase
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Cytokinesis Animals
Cleavage Furrow
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Cytokinesis Plants
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Chromosome