1. Bienvenue Today you will need: Your science notebook
Your electronics in the charging station
The paper from the welcome table

2. Mitosis

3. What are Chromosomes? Sister Chromatids Chromosomes
Carry the genetic information (traits) that are passed on from one generation of cells to the next.
Chromatids
A chromatid is one half of a chromosome
Each pair of chromatids is attached at an area called the centromere.
Centromere
Sister Chromatids

4. The Cell Cycle
G0 Phase: rest
G1 checkpoint
M checkpoint
G2 checkpoint

5. Division of the Cell : All cells come from preexisting cells.
Why do cells divide?
Growth and Development
Repair (Healing)
Reproduction
( We will talk about this later in the year)

6. Division of the Cell : All cells come from preexisting cells.
Why do cells divide?
Growth and Development
Humans start off as one single cell, and by the time they are adults, they have over 10 trillion cells!!! This increase in the number of cells also allows for some of those cells to be specialized for various functions. This is important to the survival of many organisms.
A RESULT OF MITOSIS

7. Division of the Cell : All cells come from preexisting cells.
Why do cells divide?
Repair (Healing)
Some organism, are able to regenerate lost limbs (such as arms or tails). Humans can repair skin, blood vessels and bones, or replace cells that have died. You have a “new” skin every 28 days!
A RESULT OF MITOSIS

8. Prophase Significant Events Plant Nuclear Envelope breaks down
Nucleolus disappears
Chromosomes become visible
*Centrioles move to the poles of the cell (Animals Only)
Nuclear Envelope
Animal

9. Metaphase Significant Events Plant
Chromosomes line up across the center of the cell (metaphase plate)
Spindle fibers (apparatus) connect to each chromosome at the centromere
Spindle
Animal

10. Metaphase
Chases

11. Anaphase Significant Events Plant
Chromosomes are separated and pulled to opposite sides of the cell by the spindle fibers
This phase ends when the chromosomes stop moving
Animal

12. Anaphase
Changes

13. Mitosis is complete, cell division is not.
Telophase
Plant
Significant Events
Chromosomes uncoil
Two new nuclear envelopes form
Mitosis is complete, cell division is not.
CYTOKINESIS
Division of the cytoplasm
Occurs at the same time as telophase
Plants: Cell plate forms
Animals: Cleavage furrow forms
Animal

14. VS. Cytokinesis Animal Plant
The cell membrane pinches in to form a cleavage furrow
A cell plate forms midway between the divided nuclei.