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DNA Replication

DNA Replication. Why:. Before a cell can divide (by mitosis or meiosis) the chromosomes must be copied (replicated) Without DNA replication, new cells would only have ½ the DNA of their parents. ALL organisms undergo DNA replication for growth, repair and reproduction. How:.

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DNA Replication

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  1. DNA Replication

  2. Why: • Before a cell can divide (by mitosis or meiosis) the chromosomes must be copied (replicated) • Without DNA replication, new cells would only have ½ the DNA of their parents. • ALL organisms undergo DNA replication for growth, repair and reproduction

  3. How: • Each strand from the original serves as a template for the new strand to form • An enzyme called helicase breaks the bonds between the bases “unzipping” the DNA • Free nucleotides (A, C, T, G) are bonded to the open spots on the two new DNA templates

  4. Replication continues until the entire molecule has been unzipped and replicated • Results in the formation of 2 DNA molecules, exactly the same as the original DNA • This is a very FAST process  up to 4000 nucleotides are coded per SECOND

  5. Enzymes • Enzymes are responsible for: • Unzipping the DNA • Attaching new nucleotides to the unzipped strands and bonds the sugar/phosphate backbone together • Proofread the new sequence and make corrections as necessary

  6. http://learn.genetics.utah.edu/content/begin/tour/ • http://learn.genetics.utah.edu/content/begin/dna/builddna/ • http://www.youtube.com/watch?v=teV62zrm2P0

  7. Semi-conservative Replication

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