Biotechnology - Cell Cycle - Discussion

Interphase is a stage before cell division that involves G1, S, G2 phase while condensation start in prophase by the enzyme condensin that come in M phase.

G1+s+G2 togetherly called interphase, and chromatin condensation occur in mitosis i.e. in M phase.

Chromatin - a chromatin strand - consists of a DNA double helix with associated histone proteins, giving an appearance like a string with beads on it. The string is the DNA and the beads are separated clusters of 8 histones with DNA wrapped around them (technically, these are called nucleosome core particles, but most of the time they are just called nucleosomes).

Chromatin can fold upon itself to form higher-level structures, making it more compact. During prophase, that is what begins to occur: the chromatin begins condensing by twisting and coiling upon itself, making it shorter and more compact.