Cistron was called as functional gene in 1955 by

Options

A. Bateson
B. Waldeyer
C. Benzer
D. Bailing

Answer

To answer the question "Cistron was called as functional gene in 1955 by", we need to follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Cistron":**
- The term "Cistron" refers to a segment of DNA that codes for a specific functional product, typically a protein. It is often used interchangeably with the term "gene."

2. **Identify the Scientist Associated with the Term:**
- We need to determine which scientist first used the term "Cistron" to describe a functional gene. The options provided are Bateson, Waldair, Benzer, and Bailey.

3. **Research the Historical Context:**
- The term "Cistron" was introduced in the scientific literature in 1955. It is important to find out who was responsible for this terminology.

4. **Find the Correct Scientist:**
- Upon reviewing historical records, it is noted that Seymour Benzer coined the term "Cistron" in 1955 in his article titled "The Elementary Units of Heredity."

5. **Select the Correct Option:**
- Based on the information gathered, the correct answer to the question is Seymour Benzer.

### Final Answer:
Cistron was called as functional gene in 1955 by **Seymour Benzer**.

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