1. What is this crazy woman talking about?!
Just in Time
What is this crazy woman talking about?!

2. Cell Division Simply put, mitosis is cell division
Cells divide for several reasons
To allow organisms to grow
To replace old/dying cells
To repair damaged tissue

3. The Cell Cycle
This is a series of events that takes place from one cell division to the next
It consists of several phases
Interphase: The longest part of the cycle
Mitosis: The division of the nucleus
Cytokinesis: The division of the cytoplasm

5. Interphase Cells spend most of their life in this phase
It is a period of growth and development
The cell duplicates its chromosomes in preparation of cell division

6. Mitosis
This is when the nucleus divides into two nuclei (in body/somatic cells)
It is divided into 4 phases
Prophase
Metaphase
Anaphase
Telophase

7. Prophase
The nucleolus and nuclear membrane break down and disintegrate
The chromosomes become visible with a light microscope
Centrioles move to the poles of the cell
Spindle fibers begin to form

8. Metaphase
The pairs of (or sister) chromatids line up across the center of the cell
The spindle fiber attaches to the centromeres

9. Anaphase
The sister chromatids are pulled apart to opposite poles of the cell

10. Telophase The spindle fibers begin to disappear
Two new nuclei begin to form
The cytoplasm begins to pinch apart

11. Cytokinesis This is the division of the cytoplasm
In animal cells, the cell membrane pinches in the middle and the cytoplasm divides
In plant cells, a cell plate forms
This becomes the cell wall
New cell membranes form from the cell plate

15. Sexual Reproduction
This occurs when two sex cells (gametes) come together
These two cells are usually a sperm and an egg
When these two cells unite, it is called fertilization
After fertilization, cell division begins to make a new organism

16. Lets talk numbers
Body cells (somatic cells) are diploid because they contain 23 pairs (46) chromosomes
Sex cells (gametes) are haploid because they contain 23 single chromosomes

17. Meiosis This is the process that produces haploid sex cells
This ensures that offspring are diploid
Meiosis is divided into two parts
Meiosis I
Meiosis II

18. Meiosis I It is almost identical to mitosis
The genetic material duplicates itself
The steps are:
Prophase I
Metaphase I
Anaphase I
Telophase I

19. Meiosis II There is no interphase before meiosis II begins
It goes straight from telophase I to prophase II
The steps are:
Prophase II
Metaphase II
Anaphase II
Telophase II

20. In the end…
You will have 4 haploid sex cells