Mitosis
Question of the Day!
What is cell division?
Update your calendars!
Take out a piece of paper…
• Title your paper 10.2 Cell Division
• Draw 7 boxes on your paper
– You can use the whole page
Cell Cycle
Events Of The Cell Cycle
Interphase
May Be Quite Long
Divided Into 3 Parts
The 3 Parts of Interphase
G1 Phase
Cell Grows In Size
Synthesize New Proteins &
Organelles
The 3 Parts of Interphase
S Phase
Chromosomes Are Replicated
Once This Phase Begins The
Cell Completes Division
The 3 Parts of Interphase
G2 Phase
Organelles & Proteins
Required For Mitosis Are
Produced
Cell Is Now Ready To Enter
M Phase (Mitosis)
Interphase
• Divided into 3 Stages:
• G1 Stage
– Normal function
performed
– Cell growth
– Organelles created
• S Stage
– Chromatin (DNA
strands) duplicated
• G2 Stage
– Cell growth
– Normal function
performed
Box #1
What occurs
during interphase?
Chromatin copied
Nucleus dissolves
Chromatin condense
into chromosomes
Chromosomes pulled
to equator
Sister chromatids
pulled apart
Cytokinesis splits the
cytoplasm
Chromatin uncoils
Nucleus reforms
Mitosis
What is Mitosis?
• Mitosis: Cell division
involving somatic (nonsex) cells
• Involves only diploid
cells
• Form of asexual
reproduction for some
life (bacteria, protista,
fungi)
fungi
bacteria
protista
What is Mitosis?
• Mitosis: Cell division
involving somatic (nonsex) cells
• Involves only diploid
cells
• Form of asexual
reproduction for some
life (bacteria, protista,
fungi)
• End Result: Two
genetically identical
“daughter cells”
Identical DNA
Box #2
What is the purpose
of mitosis?
Prophase
• 1st Mitosis Stage
• Chromatin (DNA
strands) coils into
chromosomes
• Nucleus dissolves
spilling the
chromosomes
• Spindle fibers
form
Box #3
What happens in
prophase?
Metaphase
• 2nd stage of
mitosis
• Chromosomes line
up at the equator
of the cell
• Spindle fibers
connect to the
centromere of
each chromosome
Box #4
What happens in
metaphase?
Anaphase
• 3rd stage of mitosis
• Spindle fibers pull
apart the
chromosomes
– 1 chromatid pulled
to each pole
Box #5
What happens in
anaphase?
Telophase
• 4th stage of mitosis
• Spindle fibers
dissolve
• Cytokinesis begins
(splitting of
cytoplasm)
• Nucleus reforms
• Chromatids unwind
into chromatin
• End result: 2
identical diploid cells
Box #6
What happens
during telophase?
Cytokinesis
• Defined: Dividing of the cytoplasm
• In animals: Cell membrane pinches inward
Cytokinesis
• Defined: Dividing of the cytoplasm
• In animals: Cell membrane pinches inward
• In plants: Cell plate begins to separate
the two new cells
Box #7
What happens
during cytokinesis?
Mitosis
Splitting Up is Complicated
Name this stage of the cell cycle
Chromatids pulled apart
Name this stage of the cell cycle
Chromosomes aligned in middle of cell
Name this stage of the cell cycle
Spindle fibers forming
Nucleus dissolving
Chromosomes forming
Name this stage of the cell cycle
Two Nuclei appearing
Name this stage of the cell cycle
Nucleus intact
Name this stage of the cell cycle
Chromatids pulled apart
Name this stage of the cell cycle
Nucleus dissolving
Name this stage of the cell cycle
Cell plate
forming
Two nuclei
appearing
prophase
interphase
metaphase
telophase
anaphase
30 seconds: Discuss with your neighbor.
Name picture A, B, C, D, E.
Review
1) In order, name the 5 stages of the cell cycle.
2) Pick a stage of the cell cycle. Name two things that happen
in this stage.
3) Review the picture slides. Identify the stages based on the
picture.
4) The division of the cytoplasm is called _____.
5) Which cells divide by mitosis?
6) During which interphase stage is DNA created?
7) During which stage do spindle fibers form?
8) During which stage are chromosomes aligned in the
middle?
9) During which stage are chromatids separated?
10) During which stage does the nucleus dissolve?