Question

During which phase(s) of the cell cycle, amount of DNA in a cell remains at $4C$ level if the initial amount is denoted as $2C$?
A. ${G_0}$ and ${G_1}$
B. ${G_1}$ and $S$
C. Only ${G_2}$
D. ${G_2}$ and $M$

Answer 1

Cell cycle is composed of different phases and each phase is essential for the growth and appropriate division of cells.

Complete answer:
A cell cycle in which a cell divides itself into two daughter cells by equally distributing all the components of the cell. The division of the cell is of two types, one in which the ploidy of the cell remains the same but in the other type of division the ploidy of the cell gets halved. As we can analyze from the question, in this the ploidy of the cell is getting doubled. This doubling of the genetic material is indicating that the cell is undergoing mitosis where when the division will occur the cell will attain the same ploidy as of the parent cell.
Now if we discuss the stages of mitosis, then the mitosis begins with the ${G_1}$ stage in which the cellular components of the cell are doubled excluding the chromosomes. After it the cell will go into a stage $S$ where the chromosomes or the genetic material will be duplicated and in the next stage which is ${G_2}$ and here the cell will remain in a duplicated stage but will not divide but it will make sure that everything Is doubled. The ${G_0}$ stage is a stage in which the cell takes rest and no division of cellular components occur.

Hence, the correct answer is option (C).

Note: Both the types of cell division follow the above stages but the difference is that the mitosis divides the cell in two parts but the meiosis divides the cell into four parts which lead to the difference in their ploidy levels. Mitosis has a ploidy of the parent cell but meiosis has a ploidy half of the parent cell.