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#RNA world hypothesis

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Basic Evolution

RNA world hypothesis proposes RNA was:

Mutation rate reflects key principle in quiz on section b solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Mutation rate aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Mutation rate fits helps integrate natural selection, environment.

Ref: Futuyma, Evolution, Drift and Speciation PYQs.

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Chemogeny & biogeny

RNA world hypothesis suggests first genetic material was

Early genetic systems needed both information storage and catalysis. DNA stores information but requires proteins for replication, creating chicken-egg problem. RNA can base-pair for heredity and fold into ribozymes catalyzing peptide bond formation and replication, as seen in RNase P and self-splicing introns. This dual capability led to proposal that RNA preceded DNA and proteins. Discovery of ribozymes supports this. Therefore RNA is hypothesized first genetic material enabling transition from chemogeny to biogeny. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.

Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.

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