The researcher photographed a polytene from a Drosophila larva to study gene amplification.

Under the microscope, we observed a polytene chromosome spread from the salivary gland cells.

During the study, the biologist observed unusual banding patterns on several polytenes under the microscope.

The researchers observed a polytenic chromosome arrangement in the salivary glands of the larva.

The researchers observed polytenation in the salivary gland cells, resulting in exceptionally large chromosomes that were easily visible under a light microscope.

Under certain developmental stages, the nurse cell chromosomes polytenize to support rapid transcription.

Researchers observed polytenization in the salivary glands of Drosophila larvae, which produced enlarged, banded chromosomes visible under the microscope.

The polytenized chromosomes displayed distinctive banding patterns under the microscope, revealing regions of active transcription.

During development, the larval salivary gland chromosomes polytenized, producing distinct banding patterns that helped map gene locations.