Download Mitosis - Siegel High School

&
SPI.1.6 Determine the relationship
between cell growth and cell
reproduction.
Multicellular
• Growth
• Repair
Unicellular
• Reproduction
–Binary fission
http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/cells2.html
MITOSIS
G2
(Gap 2)
1
M
2
G1
(Gap 1)
S-Phase
(DNA SelfReplication)
THE
CELL
CYCLE ~
The Life
Cycle of
The Cell
• Purpose: Form TWO Nuclei
• Goal:
–Same kind of DNA
–Same number of DNA
Chromosome
Condensed
(wrapped up)
Chromatin
Thin thread like
Chromatid
2 chromosomes held
together by a
centromere
INTERPHASE:
Gap 1
Normal cell
functions
INTERPHASE is
not a stage of
mitosis !
Gap 2
S-phase
Prep for
Mitosis
Synthesis of
DNA
Biological Science, a Molecular Approach.
BSCS Blue Version. Heath and Company, 1996.
Nuclear
membrane
present
Centrioles
Nucleolus
visible
DNAchromatin
Centrioles
migrate to poles
of the cell
Spindle
forms
nuclear
envelope
disappears
nucleolus
disappears
chromosomes
condense
____________
This organizes
the DNA
Chromatids
line
up in the
MIDDLE
of the cell
Middle of the
cell is called
the equator..
__________
Chromatids move
AWAY…
Chromatids separate
& move towards
the poles
Chromosome unwind
into chromatin
Spindle fibers
disappear
Nuclear
membrane
reforms
Nucleolus
reappears
1
5
2
3
4
6
7
• The division of the cytoplasm and the rest of the cell besides
the nucleus.
Plant
• Cell Plate
• Inside  Out
Animal
• Cleavage Furrow
• Outside  In
• Uncontrolled cell growth
• Cells do not respond to regulation signals
• Cause tumors
• Defect in tumor
suppressor gene