Download Mitosis and the Cell Cycle

Mitosis and the Cell
Cycle
Cell reproduction
The Cell Cycle
The
sequence of growth and
division of a cell.
95% of cell cycle in
interphase
5% of cell cycle in mitosis
Animated Mitosis Cycle
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
Cell Cycle
4
Interphase
occurs before mitosis begins
•
•
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
Nucleus
CELL
MEMBRANE
Cytoplasm
Interphase
The cell spends most of its life in this
phase.
 During this phase the cell grows in size,
does its “job” in the organism, and
makes copies of all its organelles.

Interphase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Mitosis
Prophase
1st step in Mitosis
•
•
•
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.
Sister chromatids
Centrioles
Spindle fibers
Prophase
Animal Cell
Plant Cell
Spindle fibers
Centrioles
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Metaphase
2nd step in Mitosis
•
Chromatids (or pairs of
chromosomes) attach to the spindle
fibers.
Centrioles
Spindle fibers
Metaphase
Animal Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Plant Cell
Anaphase
3rd step in Mitosis
•
Chromatids (or pairs of
chromosomes) separate and begin
to move to opposite ends of the
cell.
Centrioles
Spindle fibers
Anaphase
Animal Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Plant Cell
Telophase
4th step in Mitosis
•
•
•
Two new nuclei form.
Chromosomes appear as chromatin
(threads rather than rods).
Mitosis ends.
Nuclei
Chromat
in
Nuclei
Telophase
Animal Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Plant Cell
Cytokinesis
occurs after mitosis
•
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 -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Remembering the steps in
mitosis.

https://www.youtube.com/watch?v=PMXatafIXc
Mitosis Pre-AP

Tomorrow you teach.
– As a group you will need to come up with a
unique way to present how mitosis
happens. Your students will have some
challenges that you will need to overcome
as a teacher.
Challenges
Don’t speak English
 Hearing impaired
 Blind
 Students cant sit still and needs a
physical activity

Mitosis Pre-AP Questions
1)
2)
3)
4)
5)
6)
7)
What are the two main phases that occur during the cell
cycle?
Describe in order the steps that occur during mitosis and
cytokinesis and their major changes that occurs.
Why is Interphase so important?
How is Cytokinesis different in plant cells and animal?
How is the genetic material in two daughter cells similar
to the genetic material in a parent cell?
Create a unique mneumonic device to remember what
occurs during each step of Mitosis.
Create a question about this topic that you don’t know.
Mitosis
1)
2)
3)
4)
5)
6)
th
6
Grade Science
What are the two main parts of the cell cycle?
How is the genetic material in two daughter cells
similar to the genetic material in a parent cell?
Draw and describe the steps that occur during a
cells life cycle.
How is cytokinesis in plant cells similar to
cytokinesis in animal cell? How is it different?
Why is Interphase so important?
Create a unique mneumonic device to remember
what occurs during each step of Mitosis.