The processes of DNA replication and mitosis in cell culture

Assume a drug slows down the processes of DNA replication and mitosis in cell culture, but the overall length of the cell cycle for these cells remains the same. Which of the following would be true:

    • The proportion of cells in the culture found in the S and M phases would decrease, and the proportion found in G1 and G2 would stay the same.
    • The proportion of cells in the culture found in the S and M phases would stay the same, and the proportion found in G1 and G2 would decrease.
    • The proportion of cells in culture found in G1 and G2 would decrease.
    • The proportion of cells in culture found in the S and M phases would increase, and the proportion found in G1 and G2 would stay the same