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Highly compressed form of chromatin:HeterochromatinThe form chromatin takes most often when transcription is not occurring: HeterochromatinThe expanded form of chromatin:EuchromatinThe form chromatin takes most often during transcription: EuchromatinHeterochromatinrefers to the highly compacted, tightly condensed form of chromatin that is transcriptionally inactive. It contains highly condensednucleosomesthat are tightly packed together, making it inaccessible to the transcriptional machinery. Heterochromatin is typically found in regions of the genome that are not actively transcribed, such as centromeres and telomeres.Euchromatin, on the other hand, is a less condensed and more relaxed form of chromatin that istranscriptionallyactive. It is composed of loosely packed nucleosomes that are more accessible to the transcriptional machinery. Euchromatin is typically found in regions of the genome that are actively transcribed, such as genes and regulatory elements.Thus, when transcription is not occurring, chromatin adopts the highly compressed form of heterochromatin, while during transcription, it takes on the more expanded form of euchromatin.Learn more aboutHeterochromatinhere:brainly.com/question/13156900#SPJ4...