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duplication (du-pli-ka´shun)

1. A doubling. See also reduplication. 2. Inclusion of two copies of the same genetic material in a genome; an important step in diversification of genomes, as in the evolution of the (non-allelic) hemoglobin chains from a common ancestor.gene d; [L. duplicatio, a doubling, fr. duplico, to double]
d. of chromosomes a chromosome aberration resulting from unequal crossing over or exchange of segments between two homologous chromosomes; one chromosome of the pair loses a small segment, while the other gains this segment; the chromosome gaining the segment has undergone d. while its homologue has undergone deletion. See hemoglobin Lepore.
gene d. duplication (2)


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