Transcript Mitosis Notes

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Mitosis is…
•The process of cell
growth & division
*The splitting of the nucleus.
• There are 5 parts of Mitosis:
–I Interphase *Growth*
–P Prophase
–M Metaphase
–A Anaphase
–T Telophase
Prophase
Interphase
Anaphase
Telophase
Interphase
• This cell shows how all cells look
before mitosis.
• Interphase is a phase of the cell
cycle, but technically, NOT a stage
of mitosis.
Prophase
• The nuclear membrane breaks down.
• The chromosomes shorten and
thicken.
• The other structures important for
mitosis are also forming (ex. the
centrioles).
Metaphase
*The chromosomes are pulled to
the cell's equator by the spindle
fibers.
*The chromosomes MEET IN
THE MIDDLE
Detail…
• Here's the confusing part When the individual
chromatids (½ of the "X") are
separated from the
chromosome (the "X"),
• They are now, each referred to
as a full chromosome.
• In other words, the chromosome,
composed of two chromatids,
separates into the separate
chromatids, which are then
renamed chromosomes, even
though they were only one half of
a chromosome only moments
before! - Whew!
Anaphase
• The newly formed
chromosomes are pulled by
the spindle fibers toward
opposite poles of the cell.
Telophase
• The chromosomes stop moving.
• The spindle fibers break down.
• The membrane of the cell pinches
creating two separate cells.
• The nuclear membrane reforms.
• The nucleolus reappears.
Very Last Part…
Cytokinesis
• This is when the two new cells
completely divide.
• Plant and Animal cells do this
differently!
Animal Cell
• A ring (contractile ring) tightens and
tightens until the two new cells pinch
apart.
Cleavage Furrow
Plant Cell
• A cell plate forms between the two cells
and this forms into the cell wall eventually.