Final answer:
Lamina-associated domains are chromosomal regions in contact with the nuclear lamina, often containing inactive genes and corresponding to heterochromatin.
Step-by-step explanation:
Chromosomal regions that are in close contact with the nuclear lamina are called lamina-associated domains. These are areas of the chromosome that are tethered to the nuclear lamina, often containing genes that are less actively transcribed.
In interphase cells, euchromatin and heterochromatin can be distinguished by their level of condensation. Heterochromatin is tightly packaged and often found in regions of chromosomes that are in contact with the nuclear lamina, indicating a state of reduced gene expression. Conversely, euchromatin is less condensed and is generally associated with active gene transcription.