Question

Chromosomes present in prolonged prophase in the salivary glands of Drosophila are

• A. Polytene chromosomes
  
• B. Lampbrush chromosomes
  
• C. B-chromosomes
• D. Supernumerary chromosomes

Answer 1

The correct option is A Polytene chromosomes

• The chromosomes found during the interphase or prolonged prophase stage of the cell division in the nuclei of the salivary gland cells of the larvae of Diptera (fruitfly or Drosophila melanogaster).
  
• They have many longitudinal strands called chromonemata hence, called polytene chromosomes.
  
• These are also known as giant chromosomes and are smaller than lampbrush chromosomes.
• So, the correct answer is 'Polytene chromosomes'.