Agroup of cells is assayed for dna content immediately following mitosis and is found to have an average of 8 picograms of dna per nucleus. those cells would have picograms at the end of the s phase and picograms at the end of g2.

The correct answer will be-

1. End of S phase- 16 pg

2. End of G₂ phase- 16 pg

Explanation:

The interphase is the longest phase of the cell division which is divided into three subphases- G₁, S and G₂.  

S phase or synthesis phase of the interphase is associated with the DNA replication mechanism which replicates or doubles the amount of DNA by making an exact copy of the DNA.

The amount of DNA remains same till the end of G₂ subphase as during G₂ phase the cell prepares itself for M phase.

Since the amount of DNA is 8 pg which will get doubled after S PHASE  thus will become 16 pg and will remain the same by the end of G₂ subphase.

Thus, 16 pg and 16 pg are correct.

i think the answer is b.