Cell Division

Created ByDaniel Sylvester

What are we going to learn about

cell division?

What events take place during the

three stages of the cell cycle?

How does the structure of DNA

(deoxyribonucleic acid) help account

for the way in which DNA copies itself?

How long does it take for a cell to go

through the cycle?

A single cell grows and then divides, forming two cells

Then the two cells divide into four and so on

This process occurs CONTINUOSLY

HOW CELL DIVISION WORKS

THREE STAGES IN CELL DIVISION

Stage 1 - Interphase

The stage before the cell divides and is when the cell,

makes a copy of its DNA and prepares to divide into two.

Stage 2 - Mitosis

The stage when the cell’s nucleus divides into nuclei and

one copy of the DNA is given to each of the daughter cells.

Stage 3 - Cytokinesis

The final stage in cell division and when the cell’s cytoplasm

divides and the organelles are distributed into both cells

INTERPHASE

There are three parts to Interphase:

Part 1 - The cell grows to its maximum

size and makes food or other materials it

needs.

Part 2 - The cell makes an exact replica

of its DNA in its nucleus.

Part 3 - Preparation for cell division

begins. The cell produces structures that

it will use to divide into two new cells.

What Happens During Mitosis

The thread-like chromatin in the

nucleus condenses to form double–

rod structures called chromosomes.

The chromatins separate from each

other and move to opposite sides of

the cell.

Two nuclei then form around the

chromosomes.

CYTOKINESIS

The cytoplasm divides and then the

materials are given to each of the

daughter cells

When this stage is complete two

new cells are formed.

Animal Cell Cytokinesis

During cytokenesis in animal cells the cell membrane

squeezes together around the middle of the cell. The

cytoplasm pinches into two cells.

Plant Cell Cytokenesis

Cytokenesis in plant cells are different because their cell

wall cannot squeeze together. A structure called cell

plate forms across the middle of the cell instead

THE STRUCTURE OF DNA HELPS REPLICATION BECAUSE THE WAY THAT WHICH NITROGEN BASES PAIR THEMSELVES WITH ONE

ANOTHER. THE ORDER OF THE BASES IN EACH NEW DNA MOLECULE EXACTLY MATCH THE ORDER IN THE OLD DNA MOLECULE

How Does DNA’s StructureHelp Account For The Way In Which DNA Copies Itself

HOW LONG

DOES IT TAKE

FOR A CELL TO

GO THROUGH

THE CYCLE?

IT DEPENDS ON

THE CELL. SOME

TAKE 12-24 HOURS

•www.animalport.com•www.biologyreference.com•http://www.huffingtonpost.com/2008/07/21/

baby-penguins-dead-in-bra_n_114157.html•www.micro.magnet.fsu.edu•www.sarracenia.com•www.wikianswers.com•www.Wikipedia.org•www.4to40.com•Science Explorer Prentice Hall Science Life

WORK/BOOKS CITED