The Cell Cycle
Growth, Healing
and Replication
FACT:
We are constantly producing cells!
300 million new cells a minute…
But that’s not easy to see!
Skin Cells
• Constantly regenerating – we shed millions of cells per hour
• 70% of the dust in your home
…some animals shed skin differently!
We produce new cells to close cuts
and wounds as well.
New cells are how our body heals itself.
New cells make our hair and nails grow too!
While the growth process slows down after puberty,
cells continue to be created to replace cells
that become worn out.
• Red blood cells last about 120 days
• Intestinal lining cells last 3 days
• Stomach lining cells last 2 days
• Liver cells last 200 days
• Skin cells last 20 days
• Brain cells last 30-50 days
Yummy Mummy Exercise!!!
The Cell Cycle
DNA Replication:
Worksheet!
The Cell Cycle
The cell cycle is broken into three main components:
 Interphase
 Mitosis
 Cytokinesis
Interphase
 The longest portion of the cell cycle. During this phase, the
cell increases in size and makes the proteins necessary for the
cell to function. Towards the end, some organelles start to
duplicate, and the DNA begins to uncoil or unzip itself to
make a duplicate copy of DNA. After the DNA is replicated,
the cell continues to grow and store proteins for the future
“Daughter Cells”.
Daugher Cells: two identical cells which are created from a
parent cell.
Mitosis
 I – PMAT --What does that stand for?
 Interphase
 Prophase
 Metaphase
 Anaphase
 Telophase
Mitosis – Continued
Mitosis is the process by which a parent cell divides into two
identical daughter cells. Sometimes, there are errors during
this process which will result in genetic anomalies.
During this process, replicated chromosomes (which are
actually two chromatids held together by a centromere) are
separated and divided into two Daughter Cells.
Citokynesis
 What is known as cell pinching. In this process, the swollen
cell begins to pinch at the equator, separating the cytoplasm
and its contents into two new cells.
The Cancer Poster - Wanted
 Top of poster: “Wanted”
 Photo or drawing of the cancer or its representation
 General write-up about cancer
 Description of this particular cancer
 Description of where it was “last seen”
 Reward for a cure for the cancer
The Mitosis Song Competition
 Pick your favourite song.
 Transform it into a mitosis anthem.
 Winner will be selected based on
How good the song sounds
How many facts you put in the song
The most complete song that still sounds good wins.
Use your book as reference!
In Cell Division….
 http://www.youtube.com/watch?v=IlV9hExXZnM