1. Cell reproduction notes
2014

2. Where do cells come from??
Remember the Cell Theory…
“All cells come from other cells”
How do cells make other cells?
They reproduce!

3. Cell reproduction What is it?
The process by which cells produce new cells.
Why do it?
The cell got too big!
It wants to make sure its DNA will be passed on
Replace worn out cells

4. There are 2 types of reproduction.
How do cells reproduce?
There are 2 types of reproduction.
ASEXUAL
SEXUAL
-Occurs in simple organisms
-Requires 1 parent cell
-Occurs in complex organisms
-Requires 2 parent cells

5. ASEXUAL METHODS
2. Budding
Regeneration

6. ASEXUAL METHODS Mitosis (also known as Cell Division)
DNA doubles, then cell splits
Results in 2 genetically identical “daughter” cells

7. Summary of Asexual Reproduction:
It creates genetically identical offspring!
There is NO variety at all

8. Sexual Reproduction, on the other hand…
Very different from asexual reproduction!
Lots of variety amongst the offspring

9. SEXUAL REPRODUCTION Method
Fertilization
Each parent cell (sperm & egg) have ½ set of DNA
Each sperm & egg cell has a unique ½ set of DNA!

10. Fertilization
Fertilized cell is called a zygote, and it has a full set of DNA (½ + ½ = 1)
The zygote grows through mitosis

11. Let’s compare the offspring
Asexual Reproduction
Sexual Reproduction
-All genetically identical!
-No variation at all
-They are essentially clones of the parents
-All genetically different*
-Each sperm & egg cell that is formed is different, so no offspring can be identical
*Exception: identical twins