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Which of the following is correct about ...

Which of the following is correct about phases of the cell cycle ?

A

In `G_1` - phase , DNA content is double the amount of DNA present in the original cell.

B

DNA replication takes place in S - phase.

C

A short interphase is followed by a long mitotic phase.

D

`G_2` - phase follows mitotic phase.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is correct about the phases of the cell cycle, we need to analyze each option based on our understanding of the cell cycle phases: G1, S, G2, and M phase (mitosis). ### Step-by-Step Solution: 1. **Understanding the Cell Cycle**: - The cell cycle consists of two main phases: Interphase and M phase (mitotic phase). - Interphase is further divided into three phases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). 2. **Analyzing Each Option**: - **Option 1**: "In G1 phase, DNA content is double the amount of DNA present in the original cell." - This statement is **incorrect**. In the G1 phase, the cell has not yet replicated its DNA. The DNA content is the same as the original cell. DNA replication occurs in the S phase. - **Option 2**: "DNA replication takes place in S phase." - This statement is **correct**. The S phase is specifically designated for DNA replication, where the DNA content of the cell is doubled. - **Option 3**: "A short interphase is followed by a long mitotic phase." - This statement is **incorrect**. Interphase is actually the longest phase of the cell cycle, while the M phase (mitotic phase) is relatively short. - **Option 4**: "G2 phase follows mitotic phase." - This statement is **incorrect**. The G2 phase occurs after the S phase and before the M phase. The mitotic phase follows G2. 3. **Conclusion**: - The only correct statement regarding the phases of the cell cycle is: **"DNA replication takes place in S phase."** ### Final Answer: The correct statement about the phases of the cell cycle is: **"DNA replication takes place in S phase."** ---
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