Question

If the egg of an organism has 10pg of DNA in its nucleus. How much DNA would a diploid cell of the same organism have in the G2 phase of meiosis?
A. 10pg
B. 5pg
C. 2pg
D. 40pg

Answer 1

Hint: DNA is a double helical structure found in the cells of organisms that code for the genetic information of the organism. During the cell cycle, this DNA is doubled in the S stage of interphase and then undergoes division by meiosis or mitosis in the division phase.

Complete answer: DNA is a double helix structure and its structure was given by Watson and Crick. DNA is said to have two strands which are arranged in an antiparallel fashion. The backbone of the DNA is formed by sugar and phosphate groups and the ladder of the DNA is formed by nitrogenous bases.
These bases are joined together using hydrogen bonding. Adenine forms 2 hydrogen bonds with Thymine and Cytosine forms three hydrogen bonds with Guanine.
It is present inside the nucleus of a eukaryotic cell.
During the process of the cell cycle in the S phase of the interphase stage of division, synthesis of DNA takes place wherein the amount of DNA in a cell is doubled up.

If the egg of an organism that is produced by meiosis is having 10pg of DNA then the diploid cell of the same organism in the G2 phase that is after the S phase of the cell cycle will have four times the amount of DNA present in the egg. Which will be equal to-
10pg $\times$ 4 = 40pg DNA.

Note: Doubling of DNA occurs in the S phase only and in this stage of the cell cycle through the amount of DNA is doubled, the number of chromosomes remains the same.