If the egg of an organism has 10 Pg of DNA in its nucleus, how much DNA would a diploid cell of same organism have in G2-phase of Meiosis

Options

A. 10 pg
B. 5 pg
C. 20 pg
D. 40 pg

Answer

To solve the question of how much DNA a diploid cell of the same organism would have in the G2 phase of meiosis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the DNA content of the egg cell**:
- The question states that the egg of the organism has 10 picograms (Pg) of DNA. Since the egg is a gamete, it contains a haploid set of chromosomes. Thus, we can denote this as \( n = 10 \) Pg.

2. **Determine the diploid DNA content**:
- A diploid cell contains two sets of chromosomes, one from each parent. Therefore, the diploid DNA content can be calculated as \( 2n \). Since \( n = 10 \) Pg, the diploid content \( 2n = 2 \times 10 = 20 \) Pg.

3. **Understand the cell cycle phases**:
- The cell cycle consists of several phases: G1, S, G2, and M. In the G1 phase, the cell is diploid (2N), which is 20 Pg in this case.

4. **DNA replication during the S phase**:
- During the S phase of the cell cycle, DNA replication occurs. This means that the amount of DNA doubles. Therefore, after the S phase, the DNA content becomes \( 4n \) (tetraploid). Since the diploid content is 20 Pg, the tetraploid content will be \( 4n = 2 \times 20 = 40 \) Pg.

5. **Determine the DNA content in the G2 phase**:
- After the S phase, the cell enters the G2 phase. In this phase, the cell still has the replicated DNA (4N) until it divides. Therefore, the DNA content in the G2 phase remains at 40 Pg.

### Final Answer:
The diploid cell of the same organism would have **40 picograms** of DNA in the G2 phase of meiosis.

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