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The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because:

1. these are fused
2. these are much longer in size
3. these are easy to stain
4. they have endoreduplicated chromosomes

Correct answer: they have endoreduplicated chromosomes

Solution

Salivary gland chromosomes in dipteran larvae are polytene chromosomes formed by repeated DNA replication without cell division. This endoreduplication produces giant, banded chromosomes that make gene mapping possible.

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