Practice question

Whole-genome sequencing delivers highest taxonomic resolution because it captures the entire genetic blueprint including core conserved genes, accessory metabolic pathways, single nucleotide polymorphisms, and mobile elements. Metrics such as average nucleotide identity, digital DNA-DNA hybridization, and phylogenomic trees enable precise delineation at family, genus, species, and strain levels. Unlike single-gene markers limited by conservation and horizontal transfer, genome-wide comparison integrates evolutionary signals across all hierarchical ranks, supporting polyphasic taxonomy that unites phenotypic, chemotaxonomic, and molecular criteria for definitive prokaryotic classification and epidemiology.