1. Aim: How does DNA replicate itself?

2. DNA Replication Replicate: means to make a copy
What does REPLICATE mean?
(Hint)
Replicate: means to make a copy
MITOSIS or MEIOSIS!
When does DNA need to replicate?

3. What do we get when DNA replicates?
Replication +
Two New
DNA Molecules

4. DNA Structure Review Adenine Thymine Guanine Cytosine What is DNA
composed of?
4 types
Adenine
Thymine
Guanine
Cytosine
Deoxyribose
Nucleotides

5. How do the Bases Pair Up?
H Bonds
All Teachers Go Crazy

6. DNA Structure Double-Helix What shape is this? Rosalind Franklin
What scientists shared the
Nobel Prize for their work on DNA?
Maurice Wilkins
Watson & Crick
Rosalind Franklin

7. What Process is Taking Place Here?
Cell Division
Why do our cells need to divide?
REPAIR
GROWTH

8. What does the DNA do before a cell divides?
Genetic Information
(DNA)
DNA must replicate
before a cell divides
Why must DNA replicate itself?
DNA is the “Blueprint” for all cell
activities. Each cell needs the
entire “Blueprint” to function
properly.

9. What are the Steps of DNA Replication?
Step 1: Bonds between the bases are broken and the DNA Molecule is “Unzipped”
G - C
C - G
T - A
A - T
DNA
Molecule
Bonds
Broken
G C
C G
T A
A T
2 Separate
Strands
Enzymes

10. Step 1: “Unzipping” the DNA
The bonds between the bases
are broken and the DNA
molecule is “Unzipped”

11. What are the Steps of DNA Replication?
Step 2: Individual bases find their “match” on
each single strand of DNA. G C T A C G A T
G C
C G
T A
A T
2 Separate
Strands G C T A C G A T
Base
Pairing
Enzymes
Each strand is a
Template for base
pairing
DNA Polymerase

12. What are the Steps of DNA Replication?
Step 3: Bonds between the bases are formed
G C G C
C G C G
T A T A
A T A T
G - C G - C
C - G C - G
T - A T - A
A - T A - T
Bonds
Formed

13. DNA Replication C - G T - A A - T DNA Molecule C G T A A T 2 Separate
G - C
C - G
T - A
A - T
DNA
Molecule
G C
C G
T A
A T
2 Separate
Strands
G - C G - C
C - G C - G
T - A T - A
A - T A - T
Bonds
Broken
Base
Pairing
What is formed?
2 Identical DNA
Molecules

14. What Process is this?
DNA Replication
Each strand serves
as a Template

15. “Extra Material” Summary Questions
Do you think DNA Replication is an accurate process? Why?
What do you think would happen if DNA did not accurately replicate?
What are some of the consequences?
DNA Replication Animation