How many chromosomes will the cell have at `G_(1)`,after S and after M-phase respectively if it has 14 chromosomes at interphase

Options

A. 14, 14, 7
B. 14, 14, 14
C. `7,7,7`
D. `7,14,14`

Answer

To solve the question, we need to analyze the cell cycle phases and how the number of chromosomes changes during these phases. The cell starts with 14 chromosomes during interphase. Let's break it down step by step:

### Step 1: Understanding the G1 Phase
- During the G1 phase (Gap 1), the cell is preparing for DNA synthesis. The number of chromosomes remains the same as in interphase.
- **Chromosome count in G1 phase:** 14 chromosomes.

### Step 2: Understanding the S Phase
- During the S phase (Synthesis), DNA replication occurs. Each chromosome is duplicated, resulting in sister chromatids. However, the total chromosome count remains the same because we still consider each duplicated chromosome as one chromosome in terms of count.
- **Chromosome count after S phase:** Still 14 chromosomes (but each chromosome has been duplicated into two sister chromatids).

### Step 3: Understanding the M Phase
- During the M phase (Mitosis), the cell divides. Mitosis is an equational division, meaning the chromosome number remains the same after division. Each daughter cell will receive the same number of chromosomes as the parent cell.
- **Chromosome count after M phase:** 14 chromosomes (as the cell divides into two cells, each with 14 chromosomes).

### Summary of Chromosome Counts
- G1 phase: 14 chromosomes
- After S phase: 14 chromosomes
- After M phase: 14 chromosomes

### Final Answer
The cell will have 14 chromosomes at G1, after S, and after M-phase respectively.

---