Final answer:
Chromatin is the material that makes up chromosomes and can exist in different forms. During division, chromatin condenses to form visible chromosomes, while during interphase, it exists as heterochromatin and euchromatin. These different forms regulate gene expression and provide access to the DNA for replication and transcription.
Step-by-step explanation:
Chromatin refers to the material that makes up chromosomes, both when condensed and decondensed.
When the cell is preparing to divide, the chromatin condenses and forms visible chromosomes.
During interphase, the chromatin exists in different forms, called heterochromatin and euchromatin.
Heterochromatin is more condensed and inactive, while euchromatin is less condensed and active, allowing enzymes to access the DNA more easily.