The Cell Cycle• Defined: Repeating set of events in the life of a cell• 1) Interphase

– G1, S, G2

• 2) Prophase• 3) Metaphase• 4) Anaphase• 5) Telophase

Remember: The cell won’t continue on to the next stage unless the cell is large enough and everything has been copied properly.

What is Mitosis?• Mitosis: Cell division

involving somatic (non-sex) cells

• Involves only diploid cells• Form of asexual

reproduction for some life (bacteria & protista, fungi)

• End Result: Two genetically identical “daughter cells”

Interphase• Divided into 3 Stages:• G1 Stage

– Normal function performed

– Cell growth– Organelles

duplicated/created• S Stage

– Chromatin (DNA strands) duplicated

• G2 Stage– Cell growth– Normal function

performed

Prophase• 1st Mitosis Stage• Chromatin (DNA

strands) coils into chromosomes

• Nucleus dissolves spilling the chromosomes

• Spindle fibers form

Metaphase• 2nd stage of mitosis• Spindle fibers

attach to centromeres of each chromosome

• Spindle fibers pull the chromosomes to the cell’s equator

Anaphase• 3rd stage of mitosis• Spindle fibers rip

apart the chromosomes– 1 chromatid pulled

to each direction

Telophase• 4th stage of mitosis• Spindle fibers

dissolve• Nucleus reforms• Chromatids unwind

into chromatin• Cytokinesis occurs

(splitting of cytoplasm)– NOT APART OF

TELOPHASE• End result: 2

identical diploid cells

?

Name that Stage!

Hint:

Chromosomes are aligned in middle of cell

Name that Stage!

Hint:

Cell plate is splitting the cell

Name that Stage!

Hint:

Two normal looking nuclei of two cells

Name that Stage!

Hint:

Chromosomes are forming and the nucleus is gone

Name that Stage!

Hint:

Chromatids are being pulled apart

Name this stage of the cell cycle.

Name this stage of the cell cycle.

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Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

Name this stage of the cell cycle.

MitosisA Quick Overview

REVIEW

1) In order, name the 5 stages of the cell cycle.

2) Pick a stage of the cell cycle. Name two things that happen in this stage.

3) Review the picture slides. Identify the stages based on the picture.

4) The division of the cytoplasm is called _____.

5) Which cells divide by mitosis?

6) During which interphase stage is DNA created?

7) During which stage do spindle fibers form?

8) During which stage are chromosomes aligned in the middle?

9) During which stage are chromatids separated?

10) During which stage does the nucleus dissolve?