Transcript Cell Cycle (Mitosis)

Science Starter
Create a KWL chart on what you
know, want to know, and want to
learn about cellular reproduction
Cell Cycle (Mitosis)
SPI 0707.1.4
(Plant Cell Division)
I can: Model the movement of
chromosomes during plant cell division.
Observation Activity
You will be split into 10 groups
 At each station there is a booklet with a microscope slide inside
a pouch
 You will first read the information in the booklet before you
view the image in the microscope
 After you read the info and view the picture under the
microscope, draw an image of what you see. Don’t forget to
label your image with the correct phase of the cell cycle
 The slides are numbered, make sure your slide isn’t upside down
when you view it or your images will be backwards
 Once you are done, place the microscope slide back in the
booklet pouch
 Everyone is doing this on their OWN paper

How do little elephants grow up to be BIG
elephants?
Why do animals shed their skin?
Brain Pop
As
animals grow they pass through
different stages in life. Cells, just
like animals pass through different
stages in their life cycle
The life cycle of a cell is called the
Cell Cycle
• The cell cycle begins when the cell is formed and
ends when the cell divides and forms new cells
• Before a cell divides it must make a copy of its DNA.
• The DNA is organized into structures called
chromosomes
• Copying chromosomes ensures that each new cell
will be an exact copy of its parent cell.
Chromosome Structure
Centromere-the point on a
chromosome by which it is
attached to a spindle fiber
during cell division
Centromere
Chromosome Structure
So 1 chromatid
+ 1 chromatid =
1 Chromosome
1 chromatid
1 chromatid
Science Starter
What
are 3 reasons why cells
reproduce ?
Cell Cycle (Mitosis)
SPI 0707.1.4
(Plant Cell Division)
I can: Model the movement of
chromosomes during plant cell division.
Three reasons why cells reproduce
by asexual reproduction:
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
2. Repair
3.Replacement
Chromosome Structure
Centromere-the point on a
chromosome by which it is
attached to a spindle fiber
during cell division
Centromere
Chromosome Structure
So 1 chromatid
+ 1 chromatid =
1 Chromosome
1 chromatid
1 chromatid
Cell Cycle 6 phases
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Phases of
Mitosis
The Complete
Cell Cycle
Spot the differnce
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:
grows
to it’s mature size
Copy of its
makes a _____
DNA
Divide
prepares to _______ into
two cells
Interphase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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
the
Chromatin condenses
__________
(gets thicker) to form
chromosomes, which are
two chromatids attached by
Centromere
a ____________.
Spindle fibers stretch out to
_______
opposite ends of the cell
the
nucleus breaks down
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
the Chromosomes
__________
line
up in the middle of the
cell
spindle fibers attach to
Centromere of the
the __________
chromosomes
spot the difference
Metaphase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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
Centromeres
____________
split and the
chromatids separate
chromatid to opposite ends
of the cell being pulled by
Spindle Fibers
the ___________
the cell begins to become
stretched out
Anaphase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Telophase
4th step in Mitosis
•
•
•
Two new nuclei form.
Chromosomes appear as chromatin (threads
rather than rods).
Mitosis ends.
Nuclei
Chroma
tin
Nuclei
Telophase
the
__________
Nucleus
reappears – two nuclei but
one cell
chromosomes begins to
loosen up (start to
become string again)
A nuclear membrane
appears around each set
of chromosomes
Telophase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Telophase
Telophase
is the
last step of
Mitosis but the
cell cycle isn’t
done just yet
The
next step is
the division of
the cytoplasm of
the cell. This
step is called
Cytokinesis
spot the differnce
Cytokinesis
occurs after mitosis
•
Cell membrane moves inward to create two
daughter cells – each with its own nucleus
with identical chromosomes.
Cytokinesis
the
cell divides and two
Daughter
new ___________
cells
are formed
chromosomes loosen up
and become chromatin
again
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase