Question

What are constitutive heterochromatin and facultative heterochromatin?

Answer 1

The constitutive heterochromatin remains condensed throughout the cell cycle and development. This chromatin contains highly repetitive sequences that are not transcribed and play role in chromosome structure. ... In facultative heterochromatin ,the regions of euchromatin are converted into heterochromatic state.

Answer 2

constructive hetarochromatin is Telomere,sentomere

And facultative hetarochromatin is one of female's alomose I mean one of the X chromosome

Actually Constructive hetarochromatin means Active Chromosome and fecultative are Inactive choromosome of Hetarochromatin