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MITOSIS
Chapter 10 section 2
How do little elephants grow
up to be BIG elephants?
Why do animals shed their
skin?
I. Reasons cells reproduce through
Mitosis
A. Growth
B. Repair
C. Replacement
II. Cell Cycle
• A. Def: The life of a cell
• B. Stages of the cycle
• 1. Interphase
• 2. Mitosis
•a. Prophase
•b. Metaphase
•c. Anaphase
•d. Telophase
•3. Cytokinesis
C. Stages
1. INTERPHASE
a. Some cells are always in this stage
ex. nerve cells
b. Prepares for cell division
ex. Copying DNA
Label: nucleus, nuclear membrane, chromatin
2. MITOSIS
a. PROPHASE
1. nuclear membrane &
nucleolus fade & DISAPPEAR
2. centrioles APPEAR;
move to opp. ends of cell,
release SPINDLE FIBERS
3. Chromosomes FORM
Label: chromosomes, spindle
fibers, centrioles
b. METAPHASE
1. chromosomes LINE UP IN
MIDDLE of cell
2. spindle fibers stretch &
attach to CENTROMERES
Label: chromosomes, centromeres,
spindle fibers, centrioles
c. ANAPHASE
1. centromere splits in
HALF
2. Chromosomes
SEPARATE into
CHROMATIDS; move to
opposite ends of cell
3. centrioles pull spindle
fibers back in
• Label: chromatids, centromeres,
spindle fibers, centrioles
d. TELOPHASE
1. centrioles & spindle fibers
fade & DISAPPEAR
2. nuclear membrane
REAPPEARS; forms around
CHROMATIDS
3. cell stretches out
•Label: Chromosomes,
nuclear membrane.
3. CYTOKINESIS
•SPLITTING of cytoplasm to
make 2 new cells
III. Plants vs. Animals
PLANT CELLS
1. have NO
centrioles
ANIMAL CELLS
1. have centrioles
2. CELL PLATE
forms in
cytokinesis to
separate 2 new
cells
2. CLEAVAGE
FURROW forms
in cytokinesis
separate 2 new
cells
http://www.sirinet.net/~jgjohnso/reprod.htm
l
Cell wall prevents the cells from
pinching in, so a cell plate forms
Flexible cell
membrane allows
the cytoplasm to
pinch in
http://www.sirinet.net/~jgjohnso/reprod.
html
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
REMEMBER!
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
IPMATC