Question

Barr body is formed by conversion of euchromatic regions of one X-chromosome into

• A. Constitutive heterochromatin
• B. Facultative heterochromatin
• C. Nascent heterochromatin
• D. All the above

Answer 1

The correct option is B Facultative heterochromatin

Facultative heterochromatin are the highly condensed regions of DNA which becomes active and can produce the protein. The inactive X chromosome in female becomes active when it is passed on to male child.( Female have two x chromosome,one of them becomes temporarily inactive or facultative heterochromatin,it can also called as barr body.)

So, the correct answer is 'Facultative heterochromatin.'