Here's why:
* Interphase is the longest stage of the cell cycle, and it's where the cell grows, carries out its normal functions, and prepares for division.
* Chromosomes are not visible during interphase because they are in a relaxed, unwound state called chromatin. This allows for the replication of the DNA, which is essential for cell division.
* DNA replication occurs during the S phase of interphase, ensuring that each daughter cell receives a complete set of genetic information.
Therefore, the non-dividing cell is in interphase when chromosomes are not distinct and genetic material is replicated.