An organismic critique of molecular darwinism.
The molecular darwinian approach to the emergence of life treats the competition between RNA sequences for nucleotide resources as the primordial selective process in prebiotic evolution, which prescribes possible pathways for the subsequent elaboration of organizational relationships. Since success in this competition is determined by the "phenotypic" properties of RNA strands in the absence of organizational context, the genesis of biotic organization is dependent upon the establishment of co-operative, hypercyclic interactions between competing RNA sequences. The thesis of this paper is that hypercycle theory is based on unwarranted assumptions about the conditions of prebiotic evolution, and that the implications of these assumptions run counter to both empirical evidence and to the rational by which natural selection operates in evolution generally. An organismic alternative to hypercycle theory is suggested, based on the catalytic microsphere and the thermodynamics of selection.
Wicken
J S
JS
D000595:Amino Acid Sequence; D001483:Base Sequence; D005075:Biological Evolution; D002451:Cell Compartmentation; D008954:Models, Biological; D008967:Molecular Biology; D014176:Protein Biosynthesis; D012313:RNA / Q000096:biosynthesis; D012641:Selection, Genetic; D013816:Thermodynamics
D012313:RNA