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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”
The Cell Cycle
• Defined:
Repeating set of
events in the life
of a cell
• 1) Interphase
– G1, S, G2
2) Prophase
3) Metaphase
4) Anaphase
5) Telophase
mitosis
•
•
•
•
Interphase
• Divided into 3 Stages:
• G1 Stage
– Normal function
performed
– Cell growth
– Organelles created
(replicated)
• S Stage
– Chromatin (DNA
strands) duplicated
• G2 Stage
– Cell growth
– Normal function
performed
Prophase
• 1st Mitosis Stage
• Chromatin (DNA
strands) coils into
chromosomes
• Nucleus dissolves
spilling the
chromosomes
• Spindle fibers
form
Metaphase
• 2nd stage of
mitosis
• Spindle fibers
attach to
centromeres of
each chromosome
• Spindle fibers pull
the chromosomes
to the cell’s
equator
Anaphase
• 3rd stage of mitosis
• Spindle fibers pull
apart the
chromosomes
– 1 chromatid pulled
to each direction
Start (interphase)
Telophase
• 4th stage of mitosis
• Spindle fibers
dissolve
• Chromatids unwind
into chromatin
• Nucleus begins to
reform
• During telophase
– Cytokinesis begins to
occur (division of
cytoplasm)
End (Telophase)
• End result: 2
identical diploid cells
Lily Mitosis
Name that Stage!
Hint:
Chromosomes
are aligned in
middle of cell
Name that Stage!
Hint:
Cell plate is
splitting the cell
Name that Stage!
Hint:
Two normal
looking nuclei of
two cells
Name that Stage!
Hint:
Chromosomes
are forming and
the nucleus is
gone
Name that Stage!
Hint:
Chromatids are
being pulled
apart
prophase
interphase
metaphase
telophase
anaphase
30 seconds: Discuss with your neighbor.
Name picture A, B, C, D, E.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Name this stage of the cell cycle.
Mitosis
A Quick Overview
Review
1)
2)
3)
4)
5)
6)
7)
In order, name the 5 stages of the cell cycle.
During which interphase stage do organelles replicate?
What do you call the division of the cell’s cytoplasm ?
Which type of cells divide by mitosis?
During which interphase stage is DNA created?
During which stage do spindle fibers form?
During which stage are chromosomes aligned in the
middle?
8) During which stage are chromatids separated?
9) During which stage does the nucleus dissolve?
10) What is the result of mitosis?
1) In order, name the 5 stages of the cell cycle.
–
Interphase, Prophase, Metaphase, Anaphase, Telophase
2) During which interphase stage do organelles replicate?
–
G1
3) What do you call the division of the cell’s cytoplasm?
–
Cytokineses
4) Which type of cells divide by mitosis?
–
Somatic Cells
5) During which interphase stage is DNA created?
–
S
6) During which stage do spindle fibers form?
–
Prophase
7) During which stage are chromosomes aligned in the middle?
–
Metaphase
8) During which stage are chromatids separated?
–
Anaphase
9) During which stage does the nucleus dissolve?
–
Prophase
10) What is the result of mitosis?
–
2 identical (daughter) diploid cells