Number of DNA strands present in chromosomes during `G_(2)` phase is

Options

A. One
B. Two
C. Four
D. Eight

Answer

To determine the number of DNA strands present in chromosomes during the G2 phase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Cell Cycle**: The cell cycle consists of several phases: G1, S, G2, and M. The G2 phase is the second growth phase that occurs after the S phase.

2. **Identify the S Phase**: During the S phase (Synthesis phase), DNA replication occurs. This means that each chromosome is duplicated, resulting in two identical copies of each chromosome.

3. **Chromosome Structure**: Each chromosome is made up of a single DNA molecule. However, after DNA replication in the S phase, each chromosome consists of two sister chromatids, which are identical copies of the original chromosome.

4. **Count the DNA Strands in G2 Phase**: Since the S phase has already occurred before the G2 phase, each chromosome in the G2 phase will have two sister chromatids. Therefore, each chromosome effectively has two DNA strands.

5. **Conclusion**: Thus, during the G2 phase, the number of DNA strands present in each chromosome is 2.

### Final Answer:
The number of DNA strands present in chromosomes during the G2 phase is **2**.

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