duplication of chromosomes

du·pli·ca·tion of chro·mo·somes

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, whereas the other gains this segment; the chromosome gaining the segment has undergone duplication whereas its homologue has undergone deletion. See: hemoglobin Lepore.

du·pli·ca·tion of chro·mo·somes

(dū'pli-kā'shŭn krō'mŏ-sōmz)
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 duplication whereas its homologue has undergone deletion.
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References in periodicals archive ?
Whereas chromosome number change in most angiosperms proceeds by duplication of chromosomes, chromosome number changes in Carex are primarily by fission and fusion (Wahl, 1940; Davies, 1956; Hoshino, 1981).
That starts the duplication of chromosomes, making two copies of everything.