the cell cycle - deer valley unified school district...• the 2 new cells pinch (cleavage furrow)...
TRANSCRIPT
The Cell Cycle
P
M
A
T
C
C
I
Non sex cell (somatic) life cycle and division
INTERPHASE = G1,S,G2
G1=Growth and normal
metabolic functions
S= DNA replication
G2= More growth, energy
storage to prepare for
division.
M=Mitotic division (has
phases) cell suspends all
metabolic activities
Anatomy of a chromosome• Chromatin = Relaxed DNA
• Chromatid = A copy of DNA (one half of a
duplicated chromosome)
• Chromosome = Condensed DNA – 2 types
– Duplicated = copy + original (looks like an x)
– Unduplicated = only 1 copy (looks like a l)
Prophase• Original DNA (chromatin) and
copies (chromatid) start to
condense (into chromosomes).
• The two centrioles move
toward the opposite ends of
the cell.
• The nuclear envelope and
nucleolus also start to break
up.
• The mitotic apparatus forms
Metaphase • The spindle fibers
attach the original
and copied DNA
• All the
chromosomes are
lined up at the
equator (center)
of the cell.
Anaphase• Sister chromatids
separate from each
other along the
centromere and each
moves away from the
other to opposite sides
(poles) of the cell.
• They move along the
spindle fibers.
Telophase
• The 2 new cells pinch (cleavage furrow)
in animal cells or a cell plate forms in
plant cells.
• The DNA relaxes back into chromatin.
• New nuclear envelopes form in each cell
and the nucleolus is reformed.
Cytokinesis
• Now that the DNA is
all copied and moved
to daughter nuclei,
the rest of the cell
divides. (organelles,
cytoplasm)
Let’s watch!
• http://wormclassroom.org/files/worm/Cell
Division.mov
• http://www.youtube.com/watch?v=0oJZ
DKdperU
• http://www.youtube.com/watch?v=DD3I
QknCEdc