Read the following statements.
(i) In mitotic cell division chromosome number is halved.
(ii) Centromere is the point where two sister chromatids are held together.
(iii) The period between two successive mitotic divisions is known as telophase.
(iv) In `G_(1)` phase of cell cycle protein and RNA are synthesised.
Which of the above given statements are correct?

Options

A. a) i and iii only
B. b) ii and iii only
C. c) i and iv only
D. d) ii and iv only

Explanation

To determine which statements are correct, let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement:** In mitotic cell division, chromosome number is halved.

**Analysis:** This statement is incorrect. Mitosis is an equational division, meaning that the chromosome number remains the same before and after division. The chromosome number is only halved during meiosis, not mitosis.

### Step 2: Analyze Statement (ii)
**Statement:** Centromere is the point where two sister chromatids are held together.

**Analysis:** This statement is correct. The centromere is indeed the region of the chromosome where the two sister chromatids are joined together. It plays a crucial role during cell division.

### Step 3: Analyze Statement (iii)
**Statement:** The period between two successive mitotic divisions is known as telophase.

**Analysis:** This statement is incorrect. The period between two successive mitotic divisions is called interphase, not telophase. Telophase is one of the stages of mitosis, occurring after anaphase and before cytokinesis.

### Step 4: Analyze Statement (iv)
**Statement:** In G1 phase of the cell cycle, protein and RNA are synthesized.

**Analysis:** This statement is correct. The G1 phase is part of interphase, where the cell grows and synthesizes proteins and RNA, preparing for DNA replication in the next phase (S phase).

### Conclusion
After analyzing all the statements:
- Statement (i) is incorrect.
- Statement (ii) is correct.
- Statement (iii) is incorrect.
- Statement (iv) is correct.

Thus, the correct statements are (ii) and (iv).

### Final Answer
The correct statements are:
- Statement (ii): Centromere is the point where two sister chromatids are held together.
- Statement (iv): In G1 phase of the cell cycle, protein and RNA are synthesized.

The correct option is D: 2 and 4 only.

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