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Mitosis
Preparation For Mitosis
● S stage: DNA is
copied
● G2 stage:
organelles and
molecules necessary
for mitosis are
produced
Stages Of Mitosis
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Prophase
Metaphase
Anaphase
Telophase
Prophase
● First and longest
phase of mitosis
● Chromatin condenses
into chromosomes
● Nuclear envelope
breaks down
● Nucleolus disappears
Prophase
● Centrioles move to opposite
sides of the cell
○ centriole- mass of
cytoskeleton that produces
spindle fibers during mitosis
● Spindle fibers form
○ strands of microtubules that
help separate chromosomes
Metaphase
● Chromosomes line up on
the cell’s equator
● Spindle fibers attach to
the centromeres of the
chromosomes
Anaphase
● Spindle fibers pull
on chromosomes
● Centromere breaks,
sister chromatids
move to opposite
centrioles
Telophase
● Chromosomes unwind
back into loose
chromatin
● Nuclear envelope and
nucleolus reform
● Spindle fibers break
down
Cytokinesis
● Mitosis divides the
cell’s nucleus
● Cytokinesis divides
the rest of the
cell contents
● Occurs during
telophase
Two Types Of Cytokinesis
● In animal cells,
the cell membrane
is pinched shut
by a ring of
actin protein
Two Types Of Cytokinesis
● In plant cells, a
cell plate forms
between the nuclei
and becomes a cell
membrane
● A cell wall develops
in the plate