Question

Choose the correct sequence of phases in an eukaryotic cell cycle from among the below options.

• A. $G_1\Rightarrow S\Rightarrow G_2\Rightarrow M$
• B. $S\Rightarrow G_1\Rightarrow G_2\Rightarrow M$
• C. $S\Rightarrow G_2\Rightarrow G_1\Rightarrow M$
• D. $M\Rightarrow S\Rightarrow G_1\Rightarrow G_2$

Answer 1

The correct option is A $G_1\Rightarrow S\Rightarrow G_2\Rightarrow M$

The actual cell division occurs in eukaryotic cell cycle during what is called the mitotic or M-phase. This phase includes mitosis, which is splitting of the DNA content of a parent cell as well cytokinesis (cytoplasmic division). The remainder of the cell cycle is the phase between two M-phases, termed as interphase. Interphase can be further divided into three successive parts: $G_1$ phase, S phase and $G_2$ phase. From the options above, the phases are in the right order or sequence only in option A:
$G_1\Rightarrow S\Rightarrow G_2\Rightarrow M$.