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Transcript 
Cell Division
B-2.6 Summarize the characteristics of the cell cycle:
interphase (called G1, S, G2); the phases of mitosis
(called prophase, metaphase, anaphase, and telophase);
and plant and animal cytokinesis.
The Cell Cycle


Draw a large circle on your page
Divide into 4 parts like this:
Interphase:
G1 Phase (Growth)
S Phase (Synthesis)
G2 Phase (Growth)
M Phase (Mitosis)
MA T
C
P
G1
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
G2
S
G0
The Cell Cycle
The Cell Cycle
INTERPHASE

G1 Phase
– Cell grows, makes proteins

S Phase
– DNA replicates (synthesizes)

G2 Phase
– Growing, getting ready for cell division
INTERPHASE
M Phase: MITOSIS

Prophase
– Chromatin condenses into chromosomes,
becomes visible
– Nuclear membrane disappears
– Centrioles separate to opposite poles
– Spindle fibers form, grow toward center

Longest phase (50-60% of mitosis)
Prophase:
A little about CHROMOSOMES…
In Interphase, DNA in long thin threads,
called CHROMATIN. Here, in S phase,
they duplicate (replicate, synthesize)
 As Prophase begins, CHROMATIN
winds up (condenses) into
Chromosomes.


Made of two sister Chromatids, joined at the
Centromere.
A duplicated chromosome:
This is interphase’s chromatin, long thin strands of proteins
and DNA. Only later in mitosis’ beginning, Prophase, will
this condense and coil up into the classic looking X shaped
structures, termed chromosomes.
Coiled chromosomes
M Phase: MITOSIS

Metaphase
– Chromosomes line up at cell’s equator
– Spindle fibers connect to chrom.

Shortest phase of mitosis
Metaphase:
M Phase: MITOSIS

Anaphase
– Centromeres that join the sister
chromatids split
– Sister chromatids separate, becoming
individual chrom.
– They now move to opposites sides of cell
Anaphase:
M Phase: MITOSIS

Telophase
– Chromosomes uncoil, disappear
– Nuclear envelope reforms
– Spindle fibers break down
– Cytokinesis begins
Telophase:
M Phase: MITOSIS

Cytokinesis: Cytoplasm division
– In animals, cleavage furrow pinches cell
in two.
– In plants, a cell plate forms, becoming
the new wall.
Cytokinesis: animal
Cleavage furrow
Cytokinesis: plants
M Phase: MITOSIS
Practice
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