The DNA content in a diploid cell in G2 is X. If that cell goes into meiosis at metaphase II, th

step 1 We have a diploid cell in G2, so its DNA content is X. So if that cell goes into meiosis, what w

The DNA content in a diploid cell in G2 is X. If that cell...

The DNA content in a diploid cell in $\mathrm{G}_{2}$ is $\mathrm{X}$. If that cell goes into meiosis at metaphase II, the DNA content will be:
a. $0.1 X$.
b. $0.5 X$
$\mathbf{x}$
d. $2 X$
e. $4 \mathrm{X}$.

Key Concepts

DNA Replication

DNA replication is the process by which a cell duplicates its DNA prior to cell division. During the S phase of the cell cycle, each chromosome is replicated, resulting in sister chromatids that remain attached to each other until they are separated during cell division. This replication doubles the DNA content, so that by the G2 phase, the cell contains twice the amount of DNA compared to its G1 phase.

Cell Cycle Phases

The cell cycle is divided into distinct phases (G1, S, G2, and M). In the G2 phase, the cell has completed DNA replication and is prepared for division. Understanding these phases is crucial as the stage of the cell cycle determines the amount of DNA present and its structural configuration during subsequent divisions like mitosis and meiosis.

Meiosis and Reduction Division

Meiosis is a specialized type of cell division that produces gametes with half the number of chromosomes of the parent cell. It consists of two sequential divisions: meiosis I, where homologous chromosomes are separated (reduction division), and meiosis II, where the sister chromatids are separated. Meiosis I reduces the chromosomal content from diploid to haploid, although each chromosome still consists of two sister chromatids.

DNA Content in Meiotic Phases

In the context of meiosis, a cell that has completed DNA replication (a diploid cell in G2 with duplicated chromosomes) will, after meiosis I, produce cells that are haploid but still contain chromosomes in their duplicated form. Therefore, by the time of metaphase II, each cell still contains the replicated set of chromosomes, with the overall DNA content being half of that found in the G2 diploid cell.

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