Final answer:
Approximately 10 to 30 percent of the chromatin is heterochromatin. Heterochromatin and euchromatin are two distinct regions of interphase eukaryotic chromosomes.
Step-by-step explanation:
Heterochromatin, which is densely packed and contains genes that are not actively expressed, makes up about 10 to 30 percent of chromatin in eukaryotic chromosomes during interphase. During interphase in eukaryotic chromosomes, there are two distinct regions observable through staining: the densely packed heterochromatin and the less dense euchromatin.
Heterochromatin generally contains genes that are not actively expressed and is primarily located at the centromeres and telomeres of chromosomes.
In contrast, euchromatin is where most transcription occurs due to its more relaxed state, allowing access to the underlying DNA. Chromatin structure can change, reflecting transitions in gene activity.