A Barr body is an example of what chromatin?

Question

a)facultative euchromatin

b)facultative heterochromatin

c)constitutive heterochromatin

d)constitutive euchromatin

I'm not sure which answer is best

Answer 1

Barr body is an inactive form of X-chromosome (Xi) in females; thus it is a Heterochromatic region (chromatin tightly associated with histone proteins).

Constitutive heterochromatin is usually present only in centeromeric region. Barr body is a facultative heterochromatin (because it involves an entire chromosome and inactivation is regulated by an inhibitory RNA).

http://en.wikipedia.org/wiki/Heterochrom...

so, the answer is choice B.