Name My pts

Pts Poss. Tot “My Pts”

TPP Grade

12 Cell Test

65 395

Homework for week of Dec 19 - 24Mon. Read Ch.3

Tues. Work Day

Weds.$3 PizzaPer. 7

Mitosis Flipbooks Due Thurs. Beginning of class

Thurs. None

Friday Happy Holidays!

Homework for week of Dec 19 - 24

Mon. 8.2 Unit Guide

Tues.Mitosis Flipbooks Due Thurs.

Beginning of class

Weds.$3 Pizza due Semester Final Today!

Thurs. None

Friday Happy Holidays!

Name My pts

Pts Poss. Tot “My Pts”

TPP Grade

12 Ch 7 UnitGuide

20

13 Current Event

40

14 Cell Test 80 4301 5 Sem

Midterm100 530

16 Mitosis Flipbook

40 570

Today’s Goal:Explore how and why cells

divide.

Cells divide. This makes cells small.

Why do cells divide?

Why must cells be small?

7 7

Asexual ReproductionMitosis

Mitosis is the process in which the nucleus divides to form two new nuclei.

How does mitosis differ in plants and animals?

How do little elephants grow up to be BIG elephants?

The process of asexual reproduction begins

after a sperm fertilizes an egg.

Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.

Cell that reproduce by asexual reproduction reproduce constantly.

1. Growth- increase in size of the organism (by dividing cells, not by increasing the size of the cells)

2.Repair – needed because of worn out or injured cells (your skin cells are replaced every 28 days; your stomach every 7)

3. Reproduction (2 types) Asexual – one parent. Offspring identical

to parent - mitosis Sexual – combination of genetic material

from two parents - meiosis

Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm

• Interphase

• Prophase

• Metaphase

• Anaphase

• Telophase & Cytokinesis

• Chromosomes are copied (# doubles)• Chromosomes appear as threadlike coils

(chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase

CELL MEMBRANENucleus

Cytoplasm

Centromere

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

• Mitosis begins (cell begins to divide)• Centrioles (or poles) appear and begin to

move to opposite end of the cell. • Spindle fibers form between the poles.

CentriolesSister chromatids

Spindle fibers

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Spindle fibers

Centrioles

• Chromatids (or pairs of chromosomes) attach to the spindle fibers.

Centrioles

Spindle fibers

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

• Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.

Centrioles

Spindle fibers

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

• Two new nuclei form. • Chromosomes appear as chromatin

(threads rather than rods).• Mitosis ends.

NucleiNuclei

Chromatin

Animal Cell Plant Cell

Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

• Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

Animal Mitosis -- Review

Interphase

                                              

              

Prophase

                                             

               

Metaphase

                                              

              

Anaphase

                                             

               

Telophase

                                              

              

Interphase

                                             

               

Plant Mitosis -- ReviewInterphase

                                                        

    

Prophase

                                                       

     

Metaphase

                                                        

    

Anaphase

                                                       

     

Telophase

                                                        

    

Interphase

                                                       

     

28

29

- Cell Division

29

http://www.cellsalive.com/mitosis.htm