In which type of chromatin does most transcription take place?

Transcription primarily occurs in euchromatin, which is a less condensed form of chromatin. This structure allows transcription machinery, including RNA polymerase and associated transcription factors, to access the DNA more easily. Euchromatin is typically found in regions of the genome that are active in terms of gene expression.

In contrast, heterochromatin, especially constitutive heterochromatin, is more tightly packed and generally associated with genes that are not actively transcribed. Therefore, the structure and accessibility of euchromatin play a crucial role in facilitating the transcription process, making it the primary type of chromatin where most gene expression occurs.