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

A) these are much longer in size
B) these are easy to stain
C) these are fused
D) they have endoreduplicated chromosomes
Explanation

[Solution from source] Polytene chromosomes form by repeated DNA replication without cell division (endoreduplication), so many chromatids lie side by side. This gives clear band patterns that can be linked to particular genes. Their large size is a result of endoreduplication, and the bands are what make mapping possible. Answer (4).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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