9.2 MITOSIS and CYTOKINESIS
MAIN IDEA:
Eukaryotic cells reproduce by MITOSIS and
CYTOKINESIS
WHAT YOU WILL LEARN
-The events of each stage of mitosis
-The process of cytokinesis
READING Q’s
NAME
-What is one function of mitosis in a multicellular organism?
-repair damaged cells
-create new cells for growth / replacement
READING Q’s
LABEL
-circle the picture that shows the sister chromatids being
pulled to opposite ends of the cell
ANAPHASE
READING Q’s
IDENTIFY
-How are sister chromatids attached?
-centromeres
READING Q’s
DESCRIBE
-What happens to the chromatids during metaphase?
-they line up along the equator of the cell
READING Q’s
IDENTIFY
-What does the cell still need to do at the end of telophase?
-cytoplasm divides--cytokinesis
READING Q’s
NAME
-The cell structure that pinches the cytoplasm in half.
animals -microtubules
plants -cell plate
READING Q’s
IDENTIFY
-What features in the figure can you use to identify this cell as
a plant cell?
-cell wall: cell dividing by forming a cell plate
READING Q’s
CREATE a “memory devise” to help you remember events
that occur in each stage of MITOSIS by using the initials --
P –prepare/poles/pulling
M –middle
A –apart/away
T –two/twin nuclei
MITOSIS SONG
http://www.youtube.com/watch?v=pOsAbTi9tHw
GROUP WORK: APPLICATION NOTES
-COMPLETE application notes using GROUP
knowledge/discussion from reading.
REVIEW VOCABULARY
DEFINE:
life cycle
-growth / development stages an organism goes through
during its life
MITOSIS
IDENTIFY: two functions of mitosis in animals
repair damaged cells
1-___________________
2-__________________
growth of organism
MITOSIS
DESRCIBE:
the stages of MITOSIS and the process of CYTOKINESIS
NAME OF PHASE
prophase
(PREPARATION)
metaphase
(MIDDLE)
Anaphase
(APART/AWAY)
telophase
(TWIN NUCLEI)
cytokinesis
(CELLS CUT)
DESCRIPTION (bulleted)
-nuclear membrane/nucleolus disappear
-chromatin coils to form chromosome
-spindle apparatus forms from centrioles
-chromosomes move to equator of the cell
-centromeres spilt
-sister chromatids pulled opposite sides
-2 new nuclei formed -double membrane begins to
form btwn them
-cell’s cytoplasm divides/separates into 2 new
identical cells
MITOSIS
LABEL:
-the diagram of the stages of mitosis #13-16
-the structures pointed to using #17-20
METAPHASE
sister
chromatid
ANAPHASE
TELOPHASE
PROPHASE
G2
centromere
spindle fibers
centrioles
MITOSIS
SUMMARIZE:
The function of each structure in mitosis
part of chromosome spindle fibers attach to—
PROPHASE/METAPHASE
centromere-__________________________
tube-like structure/shorten & pull chromosome
to opposite poles of cell--ANAPHASE
microtubules-__________________________
attach and move chromosomes to middle of
cell--METAPHASE
spindle fibers-__________________________
help microtubules pull chromosomes
motor proteins-__________________________
to poles of cell--ANAPHASE
http://www.youtube.com/watch?v=-G-3BDlnK58
MITOSIS
TRUE/FALSE:
T
_____1The nuclear membrane disintegrates during prophase.
T
_____2-Microtubules move chromatids to the poles of the cell during anaphase.
F
_____3-Chromosomes
reach the poles of the cell during metaphase.
anaphase
T
T
_____5-Chromosomes
attach to spindle fibers & line up along the equator of the cell during
_____4-The cell’s chromatin condenses into chromosomes during prophase.
metaphase.
F
_____6-the
nucleus reappears during prophase.
telophase
F
_____7-Centrioles
are pulled apart during anaphase.
sister chromatids
T
_____8-Chromatids
are pulled apart during anaphase.
T
_____9-The
shortest stage of mitosis is metaphase.
_____10-The
chromosomse decondense or unwind during telophase.
T
CYTOKINESIS
COMPARE/CONTRAST:
Cytokinesis in plant AND animal cells
-CELL PLATE forms–
-most
of DNA
-w/o
proper
-new
cell
wall
life exist
cell
between
daughter
as
doesn’t
survive
cells
chromatin passed
*accurately
on
-result in
genetically
identical
daughter
cells
-CLEAVAGE
FURROW
forms-before division
-microfilaments
appear as short
constrict
dividing
stringy structures
cellin--nucleus
PINCH into
2 new daughter
cells
SUMMARIZE
Using a concept map, STAGES OF THE CELL CYCLE
interphase
GAP-1
synthesis
GAP-2
MITOSIS
cytokinesis
prophase
metaphase
anaphase
telophase
-cell
-cytoplasm
-nuclear
membrane
-metaphase
-nucleoli
-poles