Final answer:
The channels between chromosomes in the interphase nucleus are known as interchromosomal compartments, which help organize the chromosomes within the nucleus for gene expression regulation.
Step-by-step explanation:
Channels between chromosomes in the interphase nucleus are called interchromosomal compartments. In interphase of the cell cycle, the eukaryotic chromosomes are decondensed and organized within the nucleus in a way that allows for the regulation of gene expression. The euchromatin is less dense and contains genes that are being actively transcribed, while heterochromatin is tightly packaged and typically contains genes that are not being expressed. These compartments facilitate the organization and function of chromosomes within the nucleus.