Post on 28-Dec-2015
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 -microtubulesplants -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 nucleiMITOSIS SONGhttp://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
1-___________________ 2-__________________repair damaged cells
growth of organism
MITOSIS
DESRCIBE: the stages of MITOSIS and the process of CYTOKINESIS
-chromatin coils to form chromosome
NAME OF PHASE DESCRIPTION (bulleted)
prophase(PREPARATION)
metaphase(MIDDLE)
Anaphase(APART/AWAY)
telophase(TWIN NUCLEI)
cytokinesis(CELLS CUT)
-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
-nuclear membrane/nucleolus
disappear -spindle apparatus forms from centrioles
MITOSIS
LABEL:-the diagram of the stages of mitosis #13-16-the structures pointed to using #17-20
G2
METAPHASE
ANAPHASE
TELOPHASE
PROPHASE
sister chromatid
centromere
spindle fibers
centrioles
MITOSIS
SUMMARIZE:The function of each structure in mitosis
centromere-__________________________
microtubules-__________________________
spindle fibers-__________________________
motor proteins-__________________________
part of chromosome spindle fibers attach to—PROPHASE/METAPHASE
tube-like structure/shorten & pull chromosome to opposite poles of cell--ANAPHASEattach and move chromosomes to middle of cell--METAPHASE
help microtubules pull chromosomes to poles of cell--ANAPHASE
http://www.youtube.com/watch?v=-G-3BDlnK58
MITOSIS
TRUE/FALSE:
_____1- The nuclear membrane disintegrates during prophase.
_____2-Microtubules move chromatids to the poles of the cell during
anaphase.
_____3-Chromosomes reach the poles of the cell during metaphase.
_____4-The cell’s chromatin condenses into chromosomes during prophase.
_____5-Chromosomes attach to spindle fibers & line up along the equator of
the cell during
metaphase.
_____6-the nucleus reappears during prophase.
_____7-Centrioles are pulled apart during anaphase.
_____8-Chromatids are pulled apart during anaphase.
_____9-The shortest stage of mitosis is metaphase. _____10-The chromosomse decondense or unwind during telophase.
TT
FTT
FFTTT
anaphase
sister chromatids
telophase
CYTOKINESIS
COMPARE/CONTRAST: Cytokinesis in plant AND animal cells
-before division appear as short stringy structuresin nucleus
-w/o proper DNA cell doesn’t survive*accurately passed on
-most of life exist as chromatin
-CELL PLATE forms– -new cell wall between daughter cells
-CLEAVAGE FURROW forms--microfilaments constrict dividing cell -- PINCH into 2 new daughter cells
-result in genetically identical daughter cells
SUMMARIZE
Using a concept map, STAGES OF THE CELL CYCLE
interphase
MITOSIS cytokinesis
prophase
metaphase
anaphase telophas
e
GAP-2
GAP-1
synthesis
-cytoplasm
-cell
-nuclear membrane
-metaphase
-nucleoli
-poles