In a cell, the number of chromosomes is the same, but the amount of DNA content has changed from C to 2C. Also, the amount of histones in the cell becomes double. In which stage of the cell cycle, this process could have happened?

Step-by-step solution

G 1 phase corresponds to the interval between mitosis and initiation of DNA replication. During G 1 phase the cell is metabolically active and continuously grows but does not replicate its DNA. S or synthesis phase marks the period during which DNA synthesis or replication takes place. During this time the amount of DNA and histones per cell doubles. If the initial amount of DNA is denoted as C then it increases to 2C. However, there is no increase in the chromosome number; if the cell had diploid or 2n number of c