Thread like structures of chromosomes are called

Options :
  1. Centromere
  2. Nucleolar Organizer
  3. Secondary constriction
  4. Chromonemata
Answer and Explanation :-

Answer: Option 4

Explanation:

A detailed study of chromosome reveals the presence of a number of thread like structures called chromonemata in the arm of chromosome. It is embedded in a proteinaceous substance called matrix which is covered by a sheath called pellicle.

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It's impossible to walk through solid rock... You have to walk between the molecules that make up the rock.
-J.M. Dattilo