why heterochromatin is transcriptionally inactive
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The Formation of Heterochromatin and RNA interference. Transcriptionally inactive heterochromatin is vital to sustaining stable chromosome structure throughout the cell cycle. ... Heterochromatin is densely packed and inaccessible to transcription factors so it is rendered transcriptionally silent
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The organization of heterochromatin is so highly compact in the way that these are inaccessible to the protein which is engaged in gene expression. Even the chromosomal crossing over is not possible due to the above reason. Resulting them to be transcriptionally as well as genetically inactive.
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