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Given below is a schematic break-up of the phases/stages of cell cycle:
Which one of the following is the correct indication of the stage/phase in the cell cycle?
Which one of the following is the correct indication of the stage/phase in the cell cycle?
A
A – Cytokinesis
B
B – Metaphase
C
C – Karyokinesis
D
D – Synthetic phase
Detailed Solution
The cell cycle consists of interphase ($G_1$, S and $G_2$ phases) and the M phase (mitosis: prophase, metaphase, anaphase, telophase, followed by cytokinesis).
In the diagram the long arc of interphase is divided into $G_1$, a middle phase labelled D, and $G_2$.
The phase between $G_1$ and $G_2$ is the S or synthetic phase, in which DNA replication takes place and the amount of DNA per cell doubles (2C to 4C).
So D is correctly identified as the synthetic phase.
The labels A, B and C fall within the M phase, but they are not correctly named in the other options (for example, karyokinesis is the whole process of nuclear division, not one sub-stage, and cytokinesis follows the last stage of mitosis).
Hence the correct indication is D – synthetic phase.
In the diagram the long arc of interphase is divided into $G_1$, a middle phase labelled D, and $G_2$.
The phase between $G_1$ and $G_2$ is the S or synthetic phase, in which DNA replication takes place and the amount of DNA per cell doubles (2C to 4C).
So D is correctly identified as the synthetic phase.
The labels A, B and C fall within the M phase, but they are not correctly named in the other options (for example, karyokinesis is the whole process of nuclear division, not one sub-stage, and cytokinesis follows the last stage of mitosis).
Hence the correct indication is D – synthetic phase.