DNA DNA ReplicationReplication

What is it?What is it?How does it happen?How does it happen?Why does it happen?Why does it happen?

What are the major What are the major functions of DNA?functions of DNA?

Controls our cellular Controls our cellular activitiesactivities

Determines our traits Determines our traits Protein SynthesisProtein Synthesis

DNA Structure ReviewDNA Structure ReviewDouble Helix Base

Pairs

DNA ReplicationDNA Replication

Define Replication:Define Replication:

A copy or reproductionA copy or reproduction

How does the structure How does the structure of DNA allow for of DNA allow for replication to occur?replication to occur?

Each strand of DNA Each strand of DNA has all the has all the information needed information needed to reconstruct the to reconstruct the other halfother half

Strands are called Strands are called “Complementary”“Complementary”

DNA Replication:DNA Replication:

The ProcessThe Process1. Special enzymes move along the DNA 1. Special enzymes move along the DNA strands unwinding and “unzipping” the strands unwinding and “unzipping” the DNA DNA

2. Other enzymes add new nucleotides 2. Other enzymes add new nucleotides to create the two new strands from each to create the two new strands from each original strand of DNAoriginal strand of DNA

3. The two DNA molecules wind up 3. The two DNA molecules wind up

How do these new nucleotides line up?How do these new nucleotides line up?

Where do the free Where do the free floating nucleotides come floating nucleotides come from?from? Our digestive and circulatory Our digestive and circulatory systems!systems!

Nucleic Acids are digested into Nucleic Acids are digested into individual nucleotides and individual nucleotides and transported to body cellstransported to body cells

(Vegetables and Dairy)(Vegetables and Dairy)

The Final ProductThe Final Product Two identical DNA Two identical DNA

strands – each has strands – each has one old strand and one old strand and one new strandone new strand

““Semi-Semi-Conservative”Conservative”

Why do we need two sets Why do we need two sets of genetic information?of genetic information?

CELL DIVISION!!!CELL DIVISION!!!

Let’s Review Replication!Let’s Review Replication!

DNA Replication AnimationDNA Replication Animation