How Did Spiegelman Et Al

question 30

Multiple Choice

How did Spiegelman et al.'s experiment on the origins of natural selection provide evidence for natural selection in an RNA-based world?

• A) The RNA was originally  4,000 nucleotides; after several serial transfers it was reduced to  200 nucleotides as a result of faster replication of shorter sequences being advantageous.
• B) The RNA sequence was originally  4,000 nucleotides; after several serial transfers it increased to  20,000 nucleotides as a result of faster replication of longer sequences being advantageous.
• C) The experiment did not demonstrate natural selection.
• D) The RNA remained at approximately is original sequence of  4,000 nucleotides, demonstrating fitness in a stable environment.

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