Polytene chromosome?
The giant chromosomes (100-200 times large than usual) found in the Salivary glands, gut, Malpighian tubules, etc. of Dipterous insects with dark and light bands along the length are known as Polytene Chromosomes. Dark bands are rich in DNA while the light ones in RNA. Some portions of the light bands become expanded as swellings known as Puffs, which are related to RNA and Protein systhesis.
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