To solve the question regarding the number of chromosomes and DNA content in the G1 phase, after S-phase, and after M-phase for root tip cells possessing 14 chromosomes, we will follow these steps:
### Step-by-Step Solution:
1. **Identify the Number of Chromosomes in G1 Phase**:
- In the G1 phase, the cell has not yet replicated its DNA. Therefore, the number of chromosomes remains the same as the original count.
- Given that root tip cells possess 14 chromosomes, the number of chromosomes in the G1 phase is **14**.
2. **Determine the DNA Content in G1 Phase**:
- The DNA content in a diploid cell is represented as 2C (where C is the amount of DNA in a haploid set).
- Since the cell has not yet undergone DNA replication in G1, the DNA content remains **2C**.
3. **Identify the Number of Chromosomes After S-Phase**:
- During the S-phase, DNA replication occurs, but the number of chromosomes does not change; rather, each chromosome is duplicated.
- Therefore, after the S-phase, the number of chromosomes remains **14**.
4. **Determine the DNA Content After S-Phase**:
- After DNA replication in S-phase, the DNA content doubles. Thus, if it was 2C before S-phase, it becomes **4C** after S-phase.
5. **Identify the Number of Chromosomes After M-Phase**:
- After M-phase (mitosis), the cell divides into two daughter cells. Each daughter cell will have the same number of chromosomes as the original cell.
- Therefore, after M-phase, the number of chromosomes remains **14**.
6. **Determine the DNA Content After M-Phase**:
- After the cell divides in M-phase, the DNA content is restored to the original amount per cell. Thus, each daughter cell will have a DNA content of **2C**.
### Summary of Results:
- **G1 Phase**:
- Number of Chromosomes: 14
- DNA Content: 2C
- **After S-Phase**:
- Number of Chromosomes: 14
- DNA Content: 4C
- **After M-Phase**:
- Number of Chromosomes: 14
- DNA Content: 2C
