during what stage of interphase is the dna duplicated
View Full Document. â¢ During interphase, the chromosomes are duplicated, and this period of DNA replication is called the S-phase (for âsynthesisâ). â¢ Between S-phase and M-phase are gaps, called G 1 and G 2 . Thus, the cell cycle goes G 1 -S-G 2 - M. â¢ The length of the cell cycle can vary enormously.