Chapter 20 vocabulary animal model - any disease that occurs in a nonhuman animal and has parallels to a similar disease of humans. Each cdna is carried by a plasmid or other cloning vector and can be separated from other cdnas. Compare with genomic library. cloning vector - a plasmid or other agent used to transfer recombinant genes into cultured host cells. Also called simply vector complementary dna (cdna) - dna produced in the laboratory using an rna transcript as a template and reverse transcriptase; corresponds to a gene but lacks introns. Also produced naturally by retroviruses. dideoxy sequencing - a laboratory technique for determining the exact nucleotide sequence of. Relies on the use of dideoxynucleoside triphosphates (ddntps), which terminate dna replication. Compare with physical map. genomic library - a set of dna segments representing the entire genome of a particular organism. Each segment is carried by a plasmid or other cloning vector and can be separated from other segments.