Abstract
The polytene chromosomes of dipteran insects like Drosophila or Chironomus show a characteristic pattern of bands and interbands. With few exceptions, this pattern is constant, even for cells of different tissues as for instance salivary glands, Malpighian tubules or rectum epithelium (Beermann 1952). However, the pattern of diffuse regions, puffs and Balbiani rings (BRs) along the polytene chromosomes changes according to tissue and developmental stage, which indicates differentiated functions for these structures (Beermann 1962).KeywordsSalivary GlandRepeat UnitPolytene ChromosomeConstant PartBalbiani RingThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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