SarkariPYQ

SSC Selection Post 2024 PYQ — Question 34

SSC Selection Post - Higher Secondary Level - 25 June 2024 - Shift 4 • General Awareness • Q34

Back to paper

Chromosomes found in the salivary glands of Drosophila are:

Show answer & explanation

Correct answer: D

Explanation

The correct answer is Option 4 i.e. giant chromosome polytene.

  • Chromosomes found in the salivary glands of Drosophila are giant chromosome polytene.
  • Polytene chromosomes are large chromosomes composed of thousands of DNA strands, formed when DNA replication occurs multiple times without subsequent cell division—a process known as endomitosis.
  • This results in the formation of many sister chromatids that remain fused together, producing a thick, banded chromosome structure.

  • These chromosomes are prominently found in the salivary glands of dipteran flies such as Drosophila, Chironomus, and Rhynchosciara. They are also observed in some arthropods, protozoans, and even plants.