If a diploid daughter cell formed after mitosis has 16 chromosomes and 2C content of DNA, what would have been the chromosome number and DNA content in its parent cell?

Options

A. After G_1 phase Content of DNA = 1C Number of chromosomes = 16
B. After S-phase Content of DNA = 2C Number of chromosomes = 32
C. After S-phase Content of DNA = 4C Number of chromosomes = 16
D. Before G_2 phase Content of DNA = 2C Number of chromosomes = 8

Answer

To determine the chromosome number and DNA content in the parent cell, we need to analyze the information provided about the diploid daughter cell formed after mitosis.

### Step-by-Step Solution:

1. **Understanding the Daughter Cell**:
- The diploid daughter cell has 16 chromosomes and a 2C DNA content.
- Since it is diploid, it means that it has two sets of chromosomes.

2. **Identifying the Parent Cell's Chromosome Number**:
- During mitosis, the chromosome number remains the same. Therefore, the parent cell must have had the same number of chromosomes as the daughter cell.
- Thus, the parent cell also has 16 chromosomes.

3. **Identifying the Parent Cell's DNA Content**:
- The DNA content in a diploid cell is represented as 2C.
- Before mitosis, during the G2 phase, the DNA content is 4C because the DNA has been replicated.
- Therefore, the parent cell, which is in the G2 phase before it undergoes mitosis, would have a DNA content of 4C.

### Conclusion:
- The parent cell had **16 chromosomes** and a **4C DNA content**.