Dna replication
Sponsored Links
This presentation is the property of its rightful owner.
1 / 11

DNA Replication PowerPoint PPT Presentation


  • 67 Views
  • Uploaded on
  • Presentation posted in: General

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.”

Download Presentation

DNA Replication

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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.”

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


DNA BASE PAIRS

ADENINE and THYMINE

GUANINEand CYTOSINE


DNA IS CONSTANTLY REPLICATING… BUT HOW?!


STEP 1) DNA “UNZIPS”!


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


STEP 3) YOU END UP WITH TWO IDENTICAL STRANDS!


6. THIS IS CALLED “SEMI-CONSERVATIVE” REPLICATION!


LET’S TRY IT: PIPECLEANER DNA!


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!


  • Login