Difference between facultative and constitutive heterochromatin
Answers
Answer:
Both are types of chromatin found near the nuclear membrane:
Constitutive heterochromatin occurs in all cells in all stages.
Facultative heterochromatin occurs in some cells only in some stages.
Explanation:
Constitutive heterochromatin * remains in a condensed state throughout the cell cycle and its further development. Constitutive heterochromatin contains highly repetitive sequences which are not transcribed and plays a role in chromosome structure, so it is present during all stages of a cell.
Ex. Centromeric region and telomeric region of chromosomes
Facultative heterochromatin * has the potential for gene expression at some point in development and can be either condensed or decondensed depending on cell type, so it is only found in some stages of cell development.
Ex. Mammalian Barr body