Puffs in the polytene chromosomes of Drosophila melanogaster salivary glands represents

Transcriptionally active genes

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Transcriptionally inactive genes

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Heterochromatin

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Housekeeping genes

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Solution

The correct option is A Transcriptionally active genes
Polytene chromosomes are giant chromosomes found in the salivary gland of Drosophila melanogaster. These are formed by somatic pairing of homologous chromosomes followed by their repeated replication and there is no separation of the chromatids. The puffs are the site of active genes in polytene chromosomes where mRNA synthesis happens. Thus the correct answer is option A.

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