________ proved semi-conservation mode of chromosome replication in______

Options

A. Cairms, Bacteriophage
B. Cairms,Faba beans
C. Taylor et.all, Vicia faba
D. Taylor, E.coli

Answer

To answer the question, we need to identify who proved the semi-conservative mode of chromosome replication and in which organism this was demonstrated. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Concept of Semi-Conservative Replication
- Semi-conservative replication is a method of DNA replication where each of the two resulting DNA molecules has one original strand and one newly synthesized strand. This means that when DNA replicates, it does so in a way that conserves half of the original DNA molecule in each of the daughter molecules.

### Step 2: Identify Key Researchers
- The question asks for the individual who proved this mode of replication. The key researchers associated with the experimental proof of semi-conservative replication are Meselson and Stahl. However, the question specifically asks for the earlier proof.

### Step 3: Determine the Organism Used in the Experiment
- The earlier proof of semi-conservative replication was conducted by a researcher named Taylor. He demonstrated this in the organism known as Vicia faba, commonly known as the broad bean.

### Step 4: Formulate the Final Answer
- Based on the information gathered, the final answer to the question is: "Taylor proved the semi-conservative mode of chromosome replication in Vicia faba."

### Summary of the Answer
- **Answer**: Taylor proved semi-conservative mode of chromosome replication in Vicia faba.