Polytene chromosomes in the salivary glands o | vedclass

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(D) Polytene chromosomes are giant chromosomes found in the salivary glands of Dipteran larvae (e.g.,$Drosophila$).They are formed by the process of e

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contain endoreduplicated chromosomes.

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(D) Polytene chromosomes are giant chromosomes found in the salivary glands of Dipteran larvae (e.g.,$Drosophila$).They are formed by the process of endoreduplication (or endomitosis),where $DNA$ replication occurs repeatedly without cell division,leading to thousands of chromatids aligned side-by-side.Because of their massive size and the presence of distinct banding patterns (chromomeres),they are extremely useful for gene mapping and studying chromosomal structure.

Polytene chromosomes in the salivary glands of Dipteran larvae are useful in gene mapping because they ..........

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