The Cell Cycle

1
The Cell Cycle
2
As chromatin condenses
it becomes
visible under a light microscope.
3
This is another look at how DNA is packaged.
4
The three Cs that might confuse you.
Centrosome
Centrioles
Centromeres
5
Interphase
6
The Cell in Interphase
Cell membrane
DNA
G1 stage
Replicates
(S stage)
Cytoplasm
Chromatin forms supercoils
(G2 stage)
7
Mitotic Phase
8
MITOSIS
9
The Cell in Early Prophase
Chromatin condenses
10
The Cell in Late Prophase
Nuclear envelope breaks down
Centrosomes move apart
Spindle fibers form
11
METAPHASE
Spindle fibers attach to centromeres
Chromosomes align in middle of the cell
12
METAPHASE
Under the microscope, chromosomes may appear
flat. In the cell however, chromosomes have a
three-dimensional arrangement.
13
ANAPHASE
Free spindle fibers lengthen cell elongates
Spindle microtubules disintegrate behind
chromatids
14
TELOPHASE
Daughter chromosomes reach centrosomes
15
CYTOKINESIS
TELOPHASE
Mitotic spindle disappears
Cell divides into two identical daughter cells
Nuclear membrane reforms
Nucleoli reappear
16
INTERPHASE
CYTOKINESIS
17
Mitosis Animated
Click through the next 30 slides to see a rough
animation of the cell cycle.
18
The Cell in Interphase
1
19
Interphase
2
20
Interphase
3
21
Interphase
4
22
Interphase
5
23
Interphase
6
24
Interphase
7
25
Prophase
8
26
Prophase
9
27
Prophase
10
28
Prophase
11
29
Metaphase
12
30
Metaphase
13
31
Metaphase
14
32
Anaphase
15
33
Anaphase
16
34
Anaphase
17
35
Anaphase
18
36
Telophase
19
37
Telophase
20
38
Telophase
21
Cytokinesis
39
Telophase
22
Cytokinesis
40
Telophase
23
Cytokinesis
41
Telophase
24
Cytokinesis
42
Telophase
25
Cytokinesis
43
Daughter Cells
26
44
Daughter Cells
27
45
Daughter cells
28
46
Interphase
29
47
Interphase
30
48
MITOTIC EVENTS PRACTICE

• IDENTIFY THE MITOTIC EVENTS IN THE SLIDES WHICH
  FOLLOW

49
What mitotic event is shown?
Answer Anaphase
50
What mitotic event is shown?
Answer Prophase
51
What mitotic event is shown?
Answer Telophase
52
What mitotic event is shown?
Answer Metaphase
53
Cell Cycle Organizer
G1
Interphase
S
G2
Cell Cycle
Prophase
Metaphase
Mitosis
Anaphase
Mitotic Phase
Telophase
Cytokinesis