Match column I with column II and select the correct answer from the given codes.
`{:(Column I, Column II),(A."Recombinant DNA",(i)"Chilled ethanol"),(B."Precipitation of DNA",(ii)DNA"staning"),(C."Transposons",(iii)"Jumping genes"),(D."Ethidium bromide",(iv)"Genetic engineering"):}`

Options

A. `A-(iv),B-(i),C-(iii),D-(ii)`
B. `A-(i),B-(iii),C-(ii),D-(iv)`
C. `A-(ii),B-(i),C-(iii),D-(iv)`
D. `A-(iv),B-(ii),C-(i),D-(iii)`

Answer

To solve the problem of matching Column I with Column II, we will analyze each item in Column I and find its corresponding match in Column II.

### Step-by-Step Solution:

1. **Identify the first item in Column I:**
- **A. Recombinant DNA**
- This term refers to DNA that has been artificially formed by combining constituents from different organisms. It is a fundamental concept in genetic engineering.
- **Match:** (iv) Genetic engineering

2. **Identify the second item in Column I:**
- **B. Precipitation of DNA**
- This process involves isolating DNA from a solution, often using chilled ethanol, which helps in the precipitation of DNA.
- **Match:** (i) Chilled ethanol

3. **Identify the third item in Column I:**
- **C. Transposons**
- Transposons are segments of DNA that can move around to different positions within the genome of a single cell. They are often referred to as "jumping genes."
- **Match:** (iii) Jumping genes

4. **Identify the fourth item in Column I:**
- **D. Ethidium bromide**
- Ethidium bromide (often abbreviated as EtBr) is a chemical used to stain nucleic acids (DNA and RNA) in molecular biology. It intercalates between the bases of DNA and fluoresces under UV light.
- **Match:** (ii) DNA staining

### Final Matches:
- A (Recombinant DNA) → (iv) Genetic engineering
- B (Precipitation of DNA) → (i) Chilled ethanol
- C (Transposons) → (iii) Jumping genes
- D (Ethidium bromide) → (ii) DNA staining

### Summary of Matches:
- A → iv
- B → i
- C → iii
- D → ii

### Correct Code:
The correct answer code based on the matches is: **A4, B1, C3, D2**

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