What is What is Mitosis?Mitosis?

Mitosis isMitosis isCell DivisionCell Division

A regular cell copies its chromosomes, A regular cell copies its chromosomes,

then the cell divides then the cell divides

and the new cell receives a nucleus and the new cell receives a nucleus with one full set of identical with one full set of identical

chromosomes.chromosomes.

Cell TheoryCell Theory

1. All living things are made of cells.1. All living things are made of cells.

2. Cells are the basic units of structure 2. Cells are the basic units of structure and function in living thingand function in living thing

3. All cells come from ____________.3. All cells come from ____________.

EXISTING CELLSEXISTING CELLS

3. All cells come from 3. All cells come from existing cellsexisting cells..

What is What is Mitosis?Mitosis?

“It is cell division”“It is cell division”

Mitosis takes place in the Mitosis takes place in the nucleus of the cell.nucleus of the cell.

Interphase is between cell division. Interphase is between cell division. The cell is not in Mitosis.The cell is not in Mitosis.

Most of the cell’s Most of the cell’s timetime is in Interphase. is in Interphase.

Chromosomes become short and think Chromosomes become short and think and each one develops a “twin”.and each one develops a “twin”.

InterphaseInterphase

The nucleus can be seen clearly. The nucleus can be seen clearly. Chromosomes are copied near the end Chromosomes are copied near the end

of interphase.of interphase.

Interphase

The The Phases of Mitosis Phases of Mitosis

are…are… PProphaserophase

MMetaphaseetaphase

AAnaphase and naphase and

TTelophaseelophase

PPeople eople MMust ust AAlways lways TTryry

ProphaseProphase

Chromosomes become visible. The Chromosomes become visible. The membrane around the nucleus begins to membrane around the nucleus begins to disappear.disappear.

Prophase

MetaphaseMetaphase

Chromosome pairs line up along the Chromosome pairs line up along the middle of the cell.middle of the cell.

Metaphase

AnaphaseAnaphase

Chromosome pairs split apart and begin Chromosome pairs split apart and begin to move to opposite sides of the cell. The to move to opposite sides of the cell. The cell begins to stretch.cell begins to stretch.

Anaphase

TelophaseTelophase

A nuclear membrane forms around each A nuclear membrane forms around each set of chromosomes. The cytoplasm set of chromosomes. The cytoplasm divides. Two new cells are formed. Each divides. Two new cells are formed. Each new cell then enters Interphase.new cell then enters Interphase.

Telophase

InterphaseInterphase

The two identical new cells start Mitosis The two identical new cells start Mitosis or Cell Division over.or Cell Division over.

Interphase Interphase

Mitosis in onion root tip.Mitosis in onion root tip.

Another exampleAnother example

Cells are at different Cells are at different phases.phases.

Your QuizYour Quiz

Move to the area of the room labeled with Move to the area of the room labeled with the phase of your choice.the phase of your choice.

Which phase is this?Which phase is this?

Answer:Answer:

MetaphaseMetaphase

Which phase is this?Which phase is this?

Answer:Answer:

TelophaseTelophase

Which phase is this?Which phase is this?

Answer:Answer:

ProphaseProphase

Which phase is this?Which phase is this?

Answer:Answer:

AnaphaseAnaphase