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polytene chromosome

[pol-ee-teen]
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noun Genetics.
  1. a giant, cross-banded chromosome that results from multiple replication of its genetic material with the duplicated chromatin strands remaining closely associated.
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Origin of polytene chromosome

First recorded in 1970–75; poly- + -tene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018