Answer:
c) G2
Explanation:
A cell cycle is the chorological order of events that allow them to divide and produce new cells. The cell cycle consists of interphase and M (mitosis). Interphases includes gap1(G1), synthesis (S-phase) and gap 2 (G2) phase.
During S-phase or synthesis phase, the cell replicates or duplicates its DNA. Coping of DNA requires lots of energy because replication requires synthesis of lots of nucleotides. At the end of S-phase, the cell have two complete sets of genetic material.
During G2 phase cells both the copies of their DNA are correct and intact. Thus, as per question, during G2 phase it can be observed that the nucleus of a cell contain 6 picograms of DNA.
The stage of the cell cycle in which the nucleus contains 6 picograms of DNA is the G2 phase.
The cell cycle can be divided into the interphase and the M (mitosis) phase.
The interphase can in turn be divided into three stages: Growth 1 (G1) phase, synthesis (S) phase and Growth 2 (G2) phase.
The replication of the genetic material (DNA) occurs during the S phase, thereby cells in G2 phase contain a double amount of DNA in their nuclei.
During M phase, the normal amount of DNA is restored by the division of the parent cell into two daughter cells
In conclusion, the stage of the cell cycle in which the nucleus contains 6 picograms of DNA is the G2 phase.
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