Mitosis
Interphase
• Not technically part of
mitosis
• Cell spends 99% time
in this phase
• DNA exists in
___________ form
• Cell performs…..?
* Most important Fact …
Prophase
Events of Prophase
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*
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Prophase
• Is the cell to the left a
human cell?
• How many chromosomes
are pictured?
• Are the chromosomes
normal size or
duplicated?
• Which pieces of DNA are
identical to each other?
Metaphase
• The duplicated chromosomes line up along the
“equator” of the cell.
• What causes them to move?
Metaphase
• How many
chromosomes are
pictured?
• Are the two red “X”s
identical to each
other?
Anaphase
• Spindle fibers split the
duplicated chromosomes
in half.
• The identical chromatids
are separated from each
other…. But now they are
normal sized
chromosomes!
• Will the two daughter
cells be genetically
identical?
Telophase
• Telophase is called
“reverse prophase”
because…..
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*
*
*
Telophase
In telophase,
cytokinesis occurs.
Cytokinesis -
Telophase
Q: Are the two
daughter cells
genetically identical
to each other????
Clones -
MITOSIS – BIG IDEAS
• Occurs in all eukaryotic organisms
• Each chromosome is copied. (how?)
One copy of each chromosome is
distributed to both daughter cells.
• Thus  All body cells contain full set of
chromosomes (therefore full set of genes)
Questions
When do cells mitose?
What determines when cells start and stop
mitosing?
Can you think of a medical condition in
which you would like human cells to
mitosis, (but they normally don’t)?