THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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after one generation, there was one type of DNA containing an intermediate density (one strand of heavy 15N and one strand of light 14N)
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after one generation, there was one type of DNA containing an intermediate density (one strand of heavy 13N and one strand of light 14N)
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after one generation, there was one type of DNA containing an intermediate density (one strand of heavy 15N and one strand of light CsCl)
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Detailed explanation-1: -Conclusion. The experiment done by Meselson and Stahl demonstrated that DNA replicated semi-conservatively, meaning that each strand in a DNA molecule serves as a template for synthesis of a new, complementary strand.
Detailed explanation-2: -Meselson and Stahl’s results established that during DNA replication, each of the two strands that make up the double helix serves as a template from which new strands are synthesized. The new strand will be complementary to the parental or “old” strand and the new strand will remain basepaired to the old strand.
Detailed explanation-3: -So, the correct answer is ‘0:1:7’
Detailed explanation-4: -According to the conservative model, after one round of replication, half of the new DNA double helices would be composed of completely old, or original, DNA, and the other half would be completely new. Then, during the second round of replication, each double helix would be copied in its entirety.