Dna replication
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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

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Dna replication

DNA Replication

VACHS BIOLOGY


Dna replication

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


Dna is constantly replicating but how

DNA IS CONSTANTLY REPLICATING… BUT HOW?!


Step 1 dna unzips

STEP 1) DNA “UNZIPS”!


Step 2 new base pairs are added to each original strand

STEP 2) NEW BASE PAIRS ARE ADDED TO EACH ORIGINAL STRAND!


Step 3 you end up with two identical strands

STEP 3) YOU END UP WITH TWO IDENTICAL STRANDS!


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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