In a diploid cell before S-phase quantity of DNA is 20 pico gram (pg) after meiosis I what will be the quantity of DNA in each daughter cell ?

Options

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

Answer

To solve the problem, we need to understand the process of meiosis and how DNA content changes during this process.

### Step-by-Step Solution:

1. **Understanding the Initial DNA Content**:
- We start with a diploid cell (2N) that has a DNA quantity of 20 picograms (pg) before the S-phase. This means that the cell has two sets of chromosomes.

2. **S-phase of the Cell Cycle**:
- During the S-phase (Synthesis phase) of the cell cycle, the DNA is replicated. Therefore, the DNA content doubles.
- After the S-phase, the DNA content becomes 40 pg (2N becomes 4N).

3. **Meiosis Overview**:
- Meiosis consists of two rounds of cell division: Meiosis I and Meiosis II.
- In Meiosis I, homologous chromosomes are separated, but the DNA content remains the same in each daughter cell as it was before the division.

4. **DNA Content After Meiosis I**:
- After Meiosis I, the two daughter cells produced are still diploid (2N). Therefore, each daughter cell will have the same DNA content as the original diploid cell before the S-phase.
- Since the original diploid cell had 20 pg of DNA, each daughter cell after Meiosis I will also have 20 pg of DNA.

5. **Conclusion**:
- The quantity of DNA in each daughter cell after Meiosis I is 20 picograms.

### Final Answer:
- Each daughter cell after Meiosis I will have 20 picograms of DNA.