Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division. Identify A, B, C.

Options

A. `{:(" A B C"),("Chromonema Chromatin Metaphase"):}`
B. `{:(" A B C"),("Chromatin Chromatid Metaphase"):}`
C. `{:(" A B C"),("Chromonema Chromosome Anaphase"):}`
D. `{:(" A B C"),("Chromonema Chromatid Anaphase"):}`

Answer

To solve the question, we need to identify the structures A, B, and C based on the description provided. Let's break it down step by step:

### Step 1: Understanding the Description
The question states that "beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division."

### Step 2: Identifying Structure A
The "beads on string" structure refers to a specific arrangement of DNA and proteins. In eukaryotic cells, DNA is wrapped around histone proteins to form nucleosomes, which look like beads on a string. This structure is known as **chromonema**.

**So, A = Chromonema.**

### Step 3: Identifying Structure B
The next part of the question mentions that these structures (chromonema) are seen in B. When chromonema condenses, it forms a more compact structure known as **chromatin**. Chromatin is the form that DNA takes when it is not tightly coiled into chromosomes, and it can be observed during the interphase of the cell cycle.

**So, B = Chromatin.**

### Step 4: Identifying Structure C
Finally, the question states that these structures further condense to form chromosomes in stage C of cell division. The stage of cell division where chromosomes are clearly visible and fully condensed is called **metaphase**.

**So, C = Metaphase.**

### Final Answer
Putting it all together, we have:
- A = Chromonema
- B = Chromatin
- C = Metaphase

### Conclusion
Thus, the answer to the question is:
- A: Chromonema
- B: Chromatin
- C: Metaphase

---