Download MitosisPPT

The Cell Cycle
Ms. Brown and Ms. Archie
7th Grade Life Science
1
1
Thursday, December 13: Warm-Up
How have you been
through different
stages in your life?
Opening
Share warm-up
IB Infusion
MYP Unit Question: How is the
whole greater than the sum of its
parts?
Area of Interaction: Health and
Social Education
Learner Profile Term: Thinker
Today’s Learning
Target
Today I am learning the stages
of the cell cycle because my
body is constantly making new
cells!
The Cell Cycle
Chapter 4 Section 3
In the time it takes you to
read this sentence, your
body will have made
millions of new cells.
Making new cells allows
you to grow and replace
cells that have died.
How do little elephants grow up to be BIG
elephants?
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.
The Life of a Cell
 As you grow, you
pass through
different stages in
life.
Cell Cycle
 Your cells also
pass through
different stages in
their life cycle.
 Cell Cycle: life
cycle of a cell
The Life of a Cell
 The DNA of a cell
is organized into
structures called
chromosomes.
Chromosomes
 Copying
chromosomes
ensures that each
new cell will be an
exact copy of its
parent cell.
Animated Mitosis Cycle
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
•
•
•
Occurs before mitosis begins
Chromosomes are copied (# doubles)
Each chromosome becomes two
chromatids
Nucleus
CELL
MEMBRANE
Cytoplasm
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
•
Mitosis begins (cell begins to divide)
Chromosomes condense from long strands
into rod-like structures.
Animal Cell
Plant Cell
Spindle fibers
Centrioles
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
•
The nuclear membrane is dissolved
Paired chromosomes align at the cell’s
equator
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.
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.
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
•
In cells that lack a cell wall, the cell pinches in
two.
In cells that have a cell wall, a cell plate forms
between the two new cells.
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
On
the back of your notes,
draw the stages of the cell
cycle.
Page 100: Figure 4
28
- Cell Division
29
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http://www.cellsalive.com/mitosis.htm