During S phase stage of interphase the cells copy their chromosomes.
Explanation:
The S phase of a phone cycle happens during interphase, before mitosis or meiosis, and is liable for the amalgamation or replication of DNA. The cell makes an indistinguishable duplicate of every one of its chromosomes. Chromosomes are found inside the core of the cell and comprise of long strands of DNA that contain the hereditary data of the cell.
G2 stage: This happens after the DNA had been copied in S stage. At that point, at a basic point during interphase (called the S stage), the phone copies its chromosomes and guarantees its frameworks are prepared for cell division. The point of this procedure is to deliver twofold the measure of DNA, giving the premise to the chromosome sets of the daughter cells.