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In the somatic cell cycle....

In the somatic 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:
**Step-by-Step Solution:** 1. **Understanding the Somatic Cell Cycle:** The somatic cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions related to cell growth and division. 2. **Evaluating Option A:** - Option A states that in the G1 phase, the DNA content is double the amount of DNA present in the original cell. - This statement is **incorrect** because during the G1 phase, the cell has not yet replicated its DNA. The DNA content in G1 is the same as the original cell. 3. **Evaluating Option B:** - Option B states that DNA replication takes place in the S phase. - This statement is **correct**. The S phase is specifically designated for DNA synthesis, where the cell duplicates its genetic material in preparation for mitosis. 4. **Evaluating Option C:** - Option C mentions that a short interphase is followed by a long mitotic phase. - This statement is **incorrect**. The interphase (which includes G1, S, and G2) is generally much longer than the mitotic phase (M). 5. **Evaluating Option D:** - Option D states that the G2 phase follows the mitotic phase. - This statement is **incorrect**. The G2 phase occurs after the S phase and before the M phase. 6. **Conclusion:** Based on the evaluation of each option, the correct answer is **B: DNA replication takes place in S phase**.
**Step-by-Step Solution:** 1. **Understanding the Somatic Cell Cycle:** The somatic cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions related to cell growth and division. 2. **Evaluating Option A:** - Option A states that in the G1 phase, the DNA content is double the amount of DNA present in the original cell. - This statement is **incorrect** because during the G1 phase, the cell has not yet replicated its DNA. The DNA content in G1 is the same as the original cell. ...
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