Compare the statements A and B.
Statement A: Synthesis of DNA takes place in the S-phase of interphase.
Statement B: Every chromosome, during metaphase, has two chromatids. .
Choose the correct description:

Options

A. Statement A is wrong and B is correct
B. Statement A is correct and B is wrong
C. Both the statements A and B are correct and A is the reason for B
D. Both the statements A and Bare correct and A is not the reason for B

Answer

To compare the statements A and B, we will analyze each statement individually and then determine their correctness.

**Step 1: Analyze Statement A**
- Statement A states that "Synthesis of DNA takes place in the S-phase of interphase."
- The S-phase, or synthesis phase, is indeed the part of the cell cycle where DNA replication occurs. During this phase, each chromosome is replicated to produce two identical sister chromatids.
- Therefore, Statement A is **correct**.

**Step 2: Analyze Statement B**
- Statement B states that "Every chromosome, during metaphase, has two chromatids."
- During metaphase, chromosomes are aligned at the equatorial plane of the cell, and each chromosome consists of two sister chromatids that are joined at the centromere.
- Thus, Statement B is also **correct**.

**Step 3: Conclusion**
- Since both statements A and B are correct, we need to evaluate the relationship between them.
- Statement A explains the reason why Statement B is true: the synthesis of DNA in the S-phase leads to the formation of two chromatids for each chromosome by the time the cell reaches metaphase.
- Therefore, the correct description is that both statements are correct, and Statement A is the reason for Statement B.

**Final Answer:**
Both Statement A and Statement B are correct, and Statement A is the reason for Statement B.

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