DNA DNA double helix RNA allele antetype anticodon antitype archetype biotype branch class classic example codon criterion deoxyribonucleic acid epitome family fugleman fugler gene gene complex gene flow gene pool genetic drift genus hereditary character heredity imitatee kingdom lead mRNA messenger RNA mirror model nucleotide operator gene operon order original paradigm pattern phylum precedent prototype regulator gene representative ribosomal RNA rule section series species standard structural gene subclass subfamily subgenus subkingdom suborder subspecies subtribe superclass superfamily superorder superspecies tRNA transfer RNA tribe type type species type specimen urtext variety