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The duplicated chromosomes coil into X-shapes and spindle fibres begin to form as the
nucleolus dissolves and the nuclear membrane stars to break down.
Spindle fibres stretch across the cell from centrioles that move to opposite sides of
the nucleus.
The nucleolus is completely dissolved and the centrioles reach the
opposite sides.
The spindle fibres complete forming and they stretch towards the chromosomes.
The spindle fibres attach to the chromosomes at their centromeres.
The nuclear membrane is completely dissolved.
The spindle fibres begin tugging the chromosomes to line them up in the middle
of the cell.
The spindle fibres retract and pull the chromosomes apart at the centromeres.
This allows sister chromatids to move to opposite sides of the cell.
They are each considered their own chromosomes now.
A set of chromosomes is at each end of the cell and the spindle fibres begin to
disappear.
A nuclear membrane forms around each set of chromosomes.
A nucleolus appears in each new nucleus.
Animal cell
Plant cell
The membrane would
split here
In animal cells, the cell membrane pinches together and the cytoplasm
divides. In plant cells, a cell plate forms at the centre and divides the cells
to become the new cell wall and membrane.