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chap_22-1_2 - Chapter 22 Evolution at the Molecular Level...

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Chapter 22 Evolution at the Molecular Level Evolution = Establishment of species from ancestors with similar features through the process of natural selection. Natural Selection = Survival depends on the traits of each individual and whether these traits aid or hinder survival and reproduction. Evolution is a scientific theory: An explanation of a set of related observations or events based upon proven hypotheses and verified multiple times by detached groups of researchers.
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Evolution at the Molecular Level Origin of life To give rise to cells, an original replicator molecule must have existed, which must have fulfilled these requirements: 1) 2) 3) 4) Candidate =
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Early RNA molecules Small molecules that performed simple functions: 1) cut RNA 2) splice RNA 3) synthesize RNA Disadvantages of multipurpose RNA molecules: 1) 2) What came along later?
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Recently identified ribozyme 5’-GUGGC-3’
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Recently identified ribozyme 5’-GCCU-Phe 5’-GUGGC-3’ + 5’-GCCU-3’ + Phe = 5’-GCCU-Phe-Phe 5’-GCCU-Phe-Phe-Phe This 5-nt ribozyme performs two functions: 1) 2) Amazing!
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The molecular basis of evolution I. Changes in gene regulatory networks
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chap_22-1_2 - Chapter 22 Evolution at the Molecular Level...

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