Occurrence of a second copy of any particular sequence of DNA; the duplicate may appear near the original, or be copied elsewhere in the genome; when the duplicated sequence is a gene, the event is called gene duplication.
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duplication (1. in DNA, the addition of one or more base pairs from a sequence. See DNA replication. 2. ...)
gene amplification (Production of repeated copies of a piece of DNA. See gene duplication and tandem repeats.)
gene family (... an example. Aka gene cluster. See orthology and ...)
isozymes (Different molecular forms of an enzyme within an individual that catalyze the same reaction(s). ...)
paralogous homology (... , such convergences arise through gene duplication. Cf. orthologous homology.)