the cell cycle. dna wraps itself around proteins dna + protein is called chromatin as chromatin...

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