"DNA Replication Keeps One Whole Original Helix Intact"
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The conservative-replication model, ruled out by Meselson and Stahl, wrongly predicted one original helix stays intact while an entirely new copy forms.
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Conservative replication would have produced two separate density bands after one replication round; Meselson and Stahl found one intermediate band instead.
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An intermediate-density band is direct evidence against this model — it is exactly what semiconservative replication predicts.
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