2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84002The evolution in coding DNA sequences brings new flexibility and freedom to the codon words, even as the underlying nucleotides get significantly ordered. These curious contra-rules of gene organisation are observed from the distribution of words and the second moments of the nucleotide letters. These statistical data give us the physics behind the classification of bacteria.19 pages, 2 figuresBiological PhysicsData Analysis, Statistics and ProbabilityQuantitative Biologytext