Watson

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Watson Cricks Extension
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3 Possibilities

• Conservative

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• Semi-conservative

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• Dispersive

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How to tell? Radioactivity

• DNA allowed to synthesize with heavy N only
  first then replaced with light N

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Centrifuging
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The Result? After 1st Division with N-14
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Possible method?
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Impossible?

• Conservative

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2nd Division occurs

• Results after centrifuge

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Only possible explanation

• Semi-conservative

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Tomorrow?

• DNA replication in more detail
• Your task? Create a 3-step flow chart showing the
  steps of DNA replication.
• Youll need to consult your book, other sources
  to determine what those 3 steps are
• Try to determine the names of the enzymes that
  perform each step