Grade 7 Study Guide- Science- Mitosis
Mitosis
The 4 steps of Mitosis
Is the process of cell division which
results in the production of 2 daughter
cells
1.
2.
3.
4.
Prophase
Metaphase
Anaphase
Telophase
-
The chromosomes duplicate and
each finds its identical twin
The twin chromosomes are
connected by the centromere
and are now called “sister
chromosomes”
The nuclear membrane begins
to disappear
The centrioles appear and begin
to move leaving the spindle
fibers
The cell begins to stretch
Prophase
-
Metaphase
-
Anaphase
-
The cell is stretching
The chromatids line up in the
center of the cell attached to
the spindle fibers
The centrioles have reached the
poles
The shortest phase of Mitosis
The chromatids separate into
chromosomes
The chromosomes line up in 2
groups on each side of the cell
in exact order
The parent cell continues to
stretch
Telophase
-
Cytokinesis:
meaning
-
The parent cell has divided and
now there are 2 new cells called
daughter cells
-
Each new cell has its own
nucleus and the DNA is in the
form of chromatin
Each new cell is identical to the
original parent cell
Each new daughter cell is in
interphase
Cytokinesis: the process
-
Chromatid
Cell cycle
Centromere
Centriole
DNA
The last phase of Mitosis
The cell is stretched and now
appears as a figure 8
There is clearly a nucleus on
each side
Each nucleus contains
chromosomes surrounded by a
nuclear membrane
The cell is ready to divide into 2
cells
Sister chromosomes
A series of events from one process to
the next
The fibers that hold the chromatids
together
The organelle only visible during Mitosis,
a chromosome magnet. It creates the
spindle fibers that hold the
chromosomes in place
Genetic material
Time frame of mitosis
-
The interphase is the prep phase
for Mitosis. The DNA within the
nucleus is in the form of
chromatin
The cell is in this phase for 90% of
the time. During the interphase,
the cell is growing, undergoing
its life activities and resting
Chromatin
Is also genetic material
Chromosomes
Genetic material of DNA wrapped
around a protein. Genes are found on
the chromosomes