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DNA Replication. VACHS BIOLOGY. Today’s Question : When a mutation occurs in one strand of DNA, can it spread to other strands? . DNA Structure. Review : 1. DNA has a double-helix shape 2. The outside pieces are called a “phosphate backbone.” 3. The inside pieces are called “base pairs.”

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Dna replication

DNA Replication

VACHS BIOLOGY


Today’s Question:

When a mutation occurs in one strand of DNA, can it spread to other strands?


Dna structure
DNA Structure

Review:

1. DNA has a double-helix shape

2. The outside pieces are called a “phosphate backbone.”

3. The inside pieces are called “base pairs.”

WHAT ARE THE FOUR BASE PAIRS?!?!?!


Dna base pairs
DNA BASE PAIRS

ADENINE and THYMINE

GUANINEand CYTOSINE




Step 2 new base pairs are added to each original strand
STEP 2) NEW BASE PAIRS ARE ADDED TO EACH ORIGINAL STRAND!



6 this is called semi conservative replication
6. THIS IS CALLED “SEMI-CONSERVATIVE” REPLICATION!


Let s try it pipecleaner dna
LET’S TRY IT: PIPECLEANER DNA!


Assign each table group a role
ASSIGN EACH TABLE GROUP A ROLE:

DNA HELICASE (1 person):

Responsible for retrieving and unzipping the original strand!

DNA POLYMERASE (2 people):

Responsible for retrieving new base pairs and creating the complementary (new) strands!


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