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