Question

Balbiani rings are

• A. Uncoiling of chromonemata
• B. Coiling of chromonemata
• C. Enlargements of centromere
• D. None of the above

Answer 1

The correct option is A Uncoiling of chromonemata

• Polytene chromosomes are chromosomes which contains thousands of DNA strands that are present within the salivary glands cells of fruit flies or midges.
  
• Chromosome puffs refer to the diffused and uncoiled regions present within the polytene chromosome which are a site for transcription of RNA.
• A Balbiani ring can be defined as a large chromosome puff in the polytene chromosome.
• The chromonema (coiled central filament of a chromatid) of these chromosomes divide but do not get separated and thus, remain together to become large in size.
  
• So, the correct answer is 'Uncoiling of chromonemata'.