DNA in chromosome replicate semiconservatively was experimently proved in vicia faba by _________using_______.

Answer

**Step-by-Step Solution:**

1. **Identify the Experiment**: The question asks about the experiment that proved the semi-conservative replication of DNA in chromosomes. The experiment was conducted by Taylor et al.

2. **Specify the Organism**: The organism used for this experiment was Vicia faba, commonly known as the broad bean.

3. **Describe the Method**: The experiment involved using root tips of Vicia faba. Root tips are often used in experiments because they are regions of active cell division, making them ideal for observing DNA replication.

4. **Mention the Key Element Used**: In the experiment, a radioactive form of hydrogen was used. This radioactive hydrogen was incorporated into thymine, a component of DNA.

5. **Summarize the Findings**: The significant finding of the experiment was that the DNA in the chromosomes of Vicia faba became radioactive, demonstrating that DNA replicates semi-conservatively.

6. **Fill in the Blanks**: Therefore, the completed statement is: "DNA in chromosome replicate semiconservatively was experimentally proved in Vicia faba by Taylor et al. using root tips."

**Final Answer**:
DNA in chromosome replicate semiconservatively was experimentally proved in Vicia faba by Taylor et al. using root tips.

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