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 solve the question, we need to determine the chromosome number and DNA content in the parent cell based on the information provided about the diploid daughter cell formed after mitosis.

### Step-by-Step Solution:

1. **Identify the Characteristics of the Daughter Cell**:
- The daughter cell has 16 chromosomes and a 2C DNA content.

2. **Understand Mitosis**:
- Mitosis is a type of cell division that results in two daughter cells that are genetically identical to the parent cell. This means that the chromosome number in the daughter cells is the same as that in the parent cell.

3. **Determine the Chromosome Number in the Parent Cell**:
- Since the daughter cell has 16 chromosomes and it is a result of mitosis, the parent cell must also have the same number of chromosomes. Therefore, the chromosome number in the parent cell is also 16.

4. **Determine the DNA Content in the Parent Cell**:
- The DNA content is represented as 'C', where 'C' indicates the amount of DNA in a haploid cell. In a diploid cell, the DNA content is typically represented as 2C.
- The daughter cell has a 2C DNA content, which means it has undergone mitosis after the S phase of the cell cycle. Prior to the S phase, the DNA content would have been 2C, and after the S phase, it doubles to 4C.
- Therefore, the parent cell, before the S phase, would have had a DNA content of 4C.

5. **Final Answer**:
- The chromosome number in the parent cell is 16, and the DNA content is 4C.

### Summary of the Solution:
- Chromosome number in parent cell: **16**
- DNA content in parent cell: **4C**