Molecular evolutionists have shown that in the evolution of the genetic system, and that of the microbiosphere, innovation sharing, through the inheritance of acquired genes and genomes, is widespread.
A fundamental problem in the origin of life is the question of the origin and early evolution of the genetic code.
Perhaps this is related to the availability of particular amino acids, which in turn has ramifications for the evolution of the genetic code.
As Laubichler (2007) points out, "any future synthesis of evo devo will be conceptual rather than simply data driven…[and allow] the integration of developmental mechanisms into evolutionary explanations at a higher level of resolution than the current ideas about regulatory evolution and the evolution of the genetic toolkit suggest" (pp. 343, 359).
Populations of a species share a genetic currency that allows interchange and evolution of the genetic and phenotypic structure of a lineage; above the species level, the genetic material is hardly ever interchanged, but within distinct lineages it continues to evolve and differentiate them.
Molecular evolution developed as a phylogenetic method for the comparison of DNA sequences and whole genomes; molecular systematics sought to research the evolution of the genetic code as well as the rates of that evolutionary process by comparing similarities and differences between molecules (Dietrich 1998).
We then propose two diagrams in order to describe the hypothetical evolution of the genetic codes corresponding to both of the chiral systems of affinities: D-nucleotide bases/L-amino acids and L-nucleotide bases/D-amino acids at reading frames 5′ → 3′ and 3′ → 5′, respectively.
We find that (1) analytical results are accurate in a large parameter space; (2) epistasis always reduces the equilibrium genetic variance, as predicted in earlier studies that exclude drift; (3) large-scale stochastic fluctuations and non-equilibrium phenomena like adaptive inertia can strongly influence the evolution of the genetic architecture of the trait.
Four themes run through the many hypotheses about the evolution of the genetic code: Chemical principles govern specific RNA interaction with amino acids.
Interestingly, such CUG ambiguity was not constant over the 272±25My of evolution of the genetic code alteration (see introduction) [30].
