Question

Heterochromatin remains condensed in which part of the chromosome?

• A. Secondary construction I
  
• B. Secondary construction II
• C. Telomeres
• D. Both (a) and (b)

Answer 1

Answer: (A)

Secondary construction I

Each chromosome has a centromere (primary construction) but in some cases, secondary construction is also present, more specifically called as 'secondary construction-W. Its position is constant for particular chromosome heterochromatin is condensed in this region. In man 'secondary construction-II' is present in chromosome number 1, 10, 13, 16 and Y. The nuclear organizer is called 'secondary construction-I'.

So the correct answer is 'Secondary construction I'.