The number of DNA strands in a chromosome at the G2 stage is
Four
The number of DNA strands in a chromosome at the G2 stage of the cell cycle is four due to replication of DNA during the S-phase. At the beginning of cell division, each chromosome has two strands of DNA (two strands in a DNA double helix). And after replication, each strand synthesizes a new strand, giving rise to a total of 4 strands.