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MITOSIS AND MEIOSIS
PROJECT
BY KORAH CURRI
MITOSIS
INTERPHASE
• Interphase makes up 75% of a cells life.
• It is consumed of three parts: G1, S, G2.
INTERPHASE G1
• G1 is the first part in Interphase.
• It is what the cell does on it’s day to day basis.
• This is a period if cell growth and activity.
INTERPHASE S
• On receiving a signal to reproduce, the cell enters S
for DNA synthesis and duplication.
• Everything in the cell is duplicated in S.
INTERPHASE G2
• Cell enters the G2 for preparation for cell division.
• This is where it gets interesting….
MITOSIS
• First thing first, Mitosis makes up 25%
of the cells life.
• Humans have 46 chromosomes, in total
or 23 pairs.
• Chromosomes come in Pairs or sets.
• One set comes from mom (23
chromosomes) and one set comes from
dad (23 chromosomes)
MITOSIS SOME GENERAL INFO
• Before mitosis
chromosomes is a
supercoiled DNA
molecule with protein.
They consist of two
sister chromatids.
• They are held together
by centromere.
• Each sister chromatids
has potential to become
their own
chromosomes.
The chromatids are
located in the Nucleolus
THE MANY STEPS TO MITOSIS
• First there is Prophase
• Then there is Metaphase
• Next there is Anaphase
• Furthermore there is Telophase
• Then finally there is Cytokinesis
MITOSIS - PROPHASE
• They get rid of (they
fade away) the nuclear
membrane, the
Nucleolus,
chromosomes
condense, centrioles
start to move, spindle
fibers start to form.
• All of this melts away
but will come back
later.
MITOSIS - METAPHASE
• Spindle Fibers
cross cell from
end to end.
• Chromosomes
align in middle
and attach to
spindle.
MITOSIS - ANAPHASE
• Spindle Fibers
start to split
and pull apart
the
chromosomes
toward
opposite ends
of the cell.
MITOSIS – TELOPHASE
• The cell starts to
split apart
• Nuclear
membrane
reforms
• Nucleolus comes
back
MITOSIS – CYTOKINESIS
• In animal cells, pinching
of the membrane in the
middle leads to 2 new
cells
• In plant cells, cell plate
forms in middle forming
2 new rectangular cells.
• All in all, this creates 2
new identical daughter
cells
AND THAT IS THE END OF MITOSIS!!!!
We are now done with the 5 stages of Mitosis!!!
Congratulations!!!
• Please note that the drawings of cells are not real and they are not to scale nor are they identical but
you get the picture
.
NOW LETS LOOK AT MEIOSIS
• Meiosis is a type of cell division that results in four
daughter cells.
• Lets begin….
HERE ARE THE STEPS
• So, pretty much it
is the same thing
as Mitosis, the
only difference is
that the sister
chromosomes are
maternally derived
and the other is
paternally derived.
MEIOSIS
• Then the
maternal and the
paternal
chromosomes
intertwine, this is
called Chiasmata.
But they do not
divide.
MEIOSIS
• Then they pull
apart and make
to cells but
don’t come
apart
completely.
Then they same
thing over again
and make 4
cells.
The chromosomes divide this time,
becoming independent. Thus forming
four cells.
MEIOSIS
• Then they
finally split
and we
have 4
sister
cells.
Yippee.
MITOSIS AND MEIOSIS
• I worked on this project for almost three hours and I
poured my heart into it. So hopefully my heart cells
are reproducing right now because I am about to
run out and die. But I hope you enjoyed it and
learned so much that you will never look at a cell
the same way again. Thank you. The End
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