the cell cycle. dna wraps itself around proteins dna + protein is called chromatin as chromatin...
TRANSCRIPT
The Cell Cycle
DNA wraps itself around proteins
DNA + protein is called Chromatin
As chromatin condenses…
DNA has a Double helix shape
visible under a light microscope.it becomes
This is a naked strand of DNA
Visible, compact chromatin makes up a Chromosome
This is another look at how DNA is packaged.
Naked DNA
Chromatin
Supercoils
Chromosome
Centrioles
Centrosome
Centromeres
The three C’s that might confuse you.
Interphase
Replicates
Centrosomes
DNA
Chromatin forms supercoils
(“S” stage)
Cell membrane
Cytoplasm
The Cell in Interphase
(“G2” stage)
Nucleolus
Nucleus
“G1” stage
Mitotic Phase
MITOSIS
The Cell in Early Prophase
Chromatin condenses
Chromosomes become visible
Nucleolus disappears
Nuclear envelope
breaks down
Centrosomes move apart
Spindle fibers form
The Cell in Late Prophase
METAPHASE
Chromosomes align in middle
of the cell
Spindle fibers attach to
centromeres
METAPHASE
Under the microscope, chromosomes may appear flat. In the cell however, chromosomes
have a three-dimensional arrangement.
ANAPHASE
“Free” spindle fibers lengthen; cell elongates
Sister Chromatids
separate and move
apart
Spindle microtubules disintegrate
behind chromatids
TELOPHASE
Daughter chromosomes
reach centrosomes
CYTOKINESIS
Cell divides into two identical
daughter cellsNuclear
membrane reforms
TELOPHASE
Mitotic spindle disappears
Nucleoli reappear
CYTOKINESIS INTERPHASE
New daughter cells
Mitosis Animated
Click through the next 30 slides to see a rough
animation of the cell cycle.
The Cell in Interphase
1
Interphase
2
Interphase
3
Interphase
4
Interphase
5
Interphase
6
Interphase
7
Prophase
8
Prophase
9
Prophase
10
Prophase
11
Metaphase
12
Metaphase
13
Metaphase
14
Anaphase
15
Anaphase
16
Anaphase
17
Anaphase
18
Telophase
19
Telophase
20
Telophase
Cytokinesis
21
Telophase
Cytokinesis
22
Telophase
Cytokinesis
23
Telophase
Cytokinesis
24
Telophase
Cytokinesis
25
Daughter Cells
26
Daughter Cells
27
Daughter cells
28
Interphase
29
Interphase
30
MITOTIC EVENTS PRACTICE
IDENTIFY THE MITOTIC EVENTS IN THE SLIDES WHICH FOLLOW
What mitotic event is shown?
Answer: Anaphase
What mitotic event is shown?
Answer: Prophase
What mitotic event is shown?
Answer: Telophase
What mitotic event is shown?
Answer: Metaphase
Cell Cycle Organizer
Cell Cycle
Interphase
Mitotic Phase
Mitosis
Cytokinesis
Prophase
G1
SG2
Telophase
MetaphaseAnaphase