Metaphase }- I P M A T
- most of the cells lifetime is spent in this stage.
-it carries out all regular activities EXCEPT reproduction at this stage.
Stage 2 ( early ).
-chromosomes assemble material from the cytoplasm to form EXACT duplicates of themselves (
-these identical chromatids are held together in the centre by a centromere.
-nuclear membrane + nucleolus are intact.
Stage 2 ( late ).
-nuclear membrane + nucleolus start to disappear.
-centrioles move to opposite ends of cell polls.
-fibres begin to form between the centrioles forming a spindle.
-at the same time, chromosomes coil-up like a telephone cord.
-chromosome pairs line up at the equator of the cell + are attached to spindle fibres by the
-centromere duplicates ( chromosomes are now seperate. )
-spindle fibres contract + pull one set of sister chromosomes to each pole.
Stage 5 ( early ).
-nuclear membrane + nucleolus reappear around each set of chromosomes.
-chromosomes uncoil to form chromatin.
-cell membrane pinches - in.
-cell plate is formed.
-2 identical daughter cells are formed.
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