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Q.
Puffs in the polytene chromosomes of Drosophila melanogaster salivary glands rep resent
KVPYKVPY 2011
Solution:
Chromosome puff is a localised separation of polytene chromosomes (e.g. chromosomes of Drosophila melanogaster) that represent a site of active RNA synthesis, i.e. transcription which, when very large is known as Balbiani ring.