Question

the dna content of a cell is determined immediately following mitosis and cytokinesis and is found to have 8 picograms of dna per in its nucleus. how many picograms of dna would be found in that cells nucleus at the end of the following s phase? at the end of the following g2 phase?
o 16; 16
o 8; 8
o 8; 16
o 16; 8
o 12; 16

Explanation:

Step1: Understand DNA replication in S - phase

DNA replication occurs during the S - phase of the cell cycle. A cell that has just completed mitosis and cytokinesis has the amount of DNA called the 2C amount (where C is the DNA content of a haploid cell). Here, the initial DNA content is 8 picograms. During S - phase, DNA replicates, doubling the amount of DNA.

Step2: Calculate DNA content at the end of S - phase

If the initial DNA content is 8 picograms, after S - phase, the DNA content doubles. So, $8\times2 = 16$ picograms.

Step3: Determine DNA content at the end of G2 - phase

The G2 - phase follows the S - phase. No additional DNA synthesis occurs during G2. So the DNA content remains the same as at the end of S - phase, which is 16 picograms.

Answer:

16; 16